Fertilization is external, producing free-living planula larva.

体外受精，能产生自由活动的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人体生殖过程中,一个精子使一个卵子受精。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵和精子细胞成受精卵。

Only one sperm fertilises an egg.

只有一个精子使卵子受精。

Bees fertilize flowers.

蜜蜂使花受精。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的核形成后完成融合过程，形成合子核，受精过程结束。

Allogamy Cross-fertilization in plants.

植物中的异体受精。

This oosperm is you.

这颗受精卵就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育狗的间情期.狗易受精后的性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花受精花的一的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱的孢子体世代具有。由受精卵发育而来，包括基足、柄和孢蒴。孢子体是寄生在配子体上的。

Autogamy:Self-fertilization in plants.

植物的自身受精。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从同一个受精卵分裂而来，同卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整体透明法研究了草地早熟禾的假受精现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微受精的方法，并探讨小鼠附睾精子在显微注射进入卵母细胞后的受精能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，受精到出生的周数来决极早产儿是否接受进一步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假能发生随机交配和自花受精而不会成为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是同体的，生殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨卵细胞第一极体形态与核期受精卵形态、卵裂期胚胎质量的关系。

Fertilization is external, producing free-living planula larva.

体外，能产生自由活动的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人体生殖过程中,一个子使一个子。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合和子细胞成。

Only one sperm fertilises an egg.

有一个子使子。

Bees fertilize flowers.

蜜蜂使花。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的雌雄原核形成后完成融合过程，形成合子核，过程结束。

Allogamy Cross-fertilization in plants.

植物中的异体。

This oosperm is you.

这颗就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗的间情期.雌狗易后的性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花花的一些特定的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱的孢子体世代具有。由发育而来，包括基足、柄和孢蒴。孢子体是寄生在配子体上的。

Autogamy:Self-fertilization in plants.

植物的自身。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从同一个分裂而来，同双胞胎也被称作单双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整体透明法研究了草地早熟禾的假现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微的方法，并探讨小鼠附睾子在显微注射进入母细胞后的能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，到出生的周数来决定极早产儿是否接进一步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假定能发生随机交配和自花而不会成为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体的，生殖系统适于体内。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨细胞第一极体形态与原核期形态、裂期胚胎质量的关系。

Fertilization is external, producing free-living planula larva.

受精，能产生自由活动的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人生殖过程中,一个精子使一个卵子受精。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵和精子细胞成受精卵。

Only one sperm fertilises an egg.

只有一个精子使卵子受精。

Bees fertilize flowers.

蜜蜂使花受精。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的雌雄原核形成后完成融合过程，形成合子核，受精过程结束。

Allogamy Cross-fertilization in plants.

植物中的异受精。

This oosperm is you.

这颗受精卵就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗的间情期.雌狗易受精后的性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花受精花的一些特定的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱的孢子世代具有。由受精卵发育，包括基足、柄和孢蒴。孢子是寄生在配子上的。

Autogamy:Self-fertilization in plants.

植物的自身受精。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从一个受精卵分裂，卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整透明法研究了草地早熟禾的假受精现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微受精的方法，并探讨小鼠附睾精子在显微注射进入卵母细胞后的受精能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，受精到出生的周数决定极早产儿是否接受进一步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假定能发生随机交配和自花受精不会成为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄的，生殖系统适于内受精。单起源的吸虫（单殖纲）大多是鱼的寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨卵细胞第一极形态与原核期受精卵形态、卵裂期胚胎质量的关系。

Fertilization is external, producing free-living planula larva.

精，能产生自由活动的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人生殖过程中,一个精子使一个卵子精。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵和精子细胞成精卵。

Only one sperm fertilises an egg.

只有一个精子使卵子精。

Bees fertilize flowers.

蜜蜂使花精。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的雌雄原核形成后完成融合过程，形成合子核，精过程结束。

Allogamy Cross-fertilization in plants.

植物中的异精。

This oosperm is you.

这颗精卵就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗的间情期.雌狗易精后的性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花精花的一些特定的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱的孢子世代具有。由精卵发育，包括基足、柄和孢蒴。孢子是寄生在配子上的。

Autogamy:Self-fertilization in plants.

植物的自身精。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从同一个精卵分，同卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整透明法研究了草地早熟禾的假精现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微精的方法，并探讨小鼠附睾精子在显微注射进入卵母细胞后的精能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，精到出生的周数决定极早产儿是否接进一步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假定能发生随机交配和自花精不会成为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同的，生殖系统适于内精。单起源的吸虫（单殖纲）大多是鱼的寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨卵细胞第一极形态与原核期精卵形态、卵期胚胎质量的关系。

Fertilization is external, producing free-living planula larva.

外受精，能产生自由活动的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人生殖过程中,一个精一个受精。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合和精细胞成受精。

Only one sperm fertilises an egg.

只有一个精受精。

Bees fertilize flowers.

蜜蜂花受精。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的雌雄原核形成后完成融合过程，形成合核，受精过程结束。

Allogamy Cross-fertilization in plants.

植物中的异受精。

This oosperm is you.

这颗受精就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗的间情期.雌狗易受精后的性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花受精花的一些特定的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱的世代具有。由受精发育而来，包括基足、柄和蒴。是寄生在配上的。

Autogamy:Self-fertilization in plants.

植物的自身受精。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从同一个受精分裂而来，同双胞胎也被称作单双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整透明法研究了草地早熟禾的假受精现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微受精的方法，并探讨小鼠附睾精在显微注射进入母细胞后的受精能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，受精到出生的周数来决定极早产儿是否接受进一步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种园理论，是以假定能发生随机交配和自花受精而不会成为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同的，生殖系统适于内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨细胞第一极形态与原核期受精形态、裂期胚胎质量的关系。

Fertilization is external, producing free-living planula larva.

体外精，能产生自由活动的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人体生殖过程中,个精使个卵精。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵和精细胞成精卵。

Only one sperm fertilises an egg.

只有个精使卵精。

Bees fertilize flowers.

蜜蜂使花精。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的雌雄原形成后完成融合过程，形成合，精过程结束。

Allogamy Cross-fertilization in plants.

植物中的异体精。

This oosperm is you.

这颗精卵就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗的间情期.雌狗易精后的性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该般出在具有闭花精花的些特定的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱的孢体世代具有。由精卵发育而来，包括基足、柄和孢蒴。孢体是寄生在配体上的。

Autogamy:Self-fertilization in plants.

植物的自身精。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从同个精卵分裂而来，同卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整体透明法研究了草地早熟禾的假精。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微精的方法，并探讨小鼠附睾精在显微注射进入卵母细胞后的精能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，精到出生的周数来决定极早产儿是否接进步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种园理论，是以假定能发生随机交配和自花精而不会成为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体的，生殖系统适于体内精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨卵细胞第极体形态与原期精卵形态、卵裂期胚胎质量的关系。

Fertilization is external, producing free-living planula larva.

体外受精，能产生自由活动幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人体生殖过程中,一个精子使一个卵子受精。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵和精子细胞成受精卵。

Only one sperm fertilises an egg.

只有一个精子使卵子受精。

Bees fertilize flowers.

蜜蜂使花受精。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟雌雄原核形成后完成融合过程，形成合子核，受精过程结束。

Allogamy Cross-fertilization in plants.

植物中异体受精。

This oosperm is you.

这颗受精卵就你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗间情期.雌狗易受精后性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花受精花一些特定植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

苔藓和地钱孢子体世代具有。由受精卵发育而来，包括基足、柄和孢蒴。孢子体寄生在配子体上。

Autogamy:Self-fertilization in plants.

植物自身受精。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

从同一个受精卵分裂而来，同卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整体透明法研究了草地早熟禾假受精现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目:建立显微受精方法，并探讨小鼠附睾精子在显微注射进入卵母细胞后受精能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，受精到出生周数来决定极早产儿否接受进一步关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，以假定能发生随机交配和自花受精而不会成严重问题依据。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫雌雄同体，生殖系统适于体内受精。单起源吸虫（单殖纲）大多鱼外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目探讨卵细胞第一极体形态与原核期受精卵形态、卵裂期胚胎质量关系。

Fertilization is external, producing free-living planula larva.

体外受精，能产生自的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人体生殖过程中,个精子使个卵子受精。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵和精子细胞成受精卵。

Only one sperm fertilises an egg.

只有个精子使卵子受精。

Bees fertilize flowers.

蜜蜂使花受精。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的雌雄原核形成后完成融合过程，形成合子核，受精过程结束。

Allogamy Cross-fertilization in plants.

植物中的异体受精。

This oosperm is you.

这颗受精卵就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗的间情期.雌狗易受精后的性不跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象般出现在具有闭花受精花的些特定的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱的孢子体世代具有。受精卵发育而来，包括基足、柄和孢蒴。孢子体是寄生在配子体上的。

Autogamy:Self-fertilization in plants.

植物的自身受精。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是个受精卵分裂而来，卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整体透明法研究了草地早熟禾的假受精现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微受精的方法，并探讨小鼠附睾精子在显微注射进入卵母细胞后的受精能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，受精到出生的周数来决定极早产儿是否接受进步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假定能发生随机交配和自花受精而不会成为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄体的，生殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨卵细胞第极体形态与原核期受精卵形态、卵裂期胚胎质量的关系。

Fertilization is external, producing free-living planula larva.

体外，能产生自由活动浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人体生殖过程中,一个子使一个卵子。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵和子细胞成卵。

Only one sperm fertilises an egg.

只有一个子使卵子。

Bees fertilize flowers.

蜜蜂使花。

The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟雌雄原核形成后完成融合过程，形成合子核，过程结束。

Allogamy Cross-fertilization in plants.

植物中异体。

This oosperm is you.

这卵就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

绝育雌狗期.雌狗易后性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花花一些特定植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为苔藓和地钱孢子体世代具有。由卵发育而来，包括基足、柄和孢蒴。孢子体是寄生在配子体上。

Autogamy:Self-fertilization in plants.

植物自身。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从同一个卵分裂而来，同卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整体透明法研究了草地早熟禾假现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目:建立显微方法，并探讨小鼠附睾子在显微注射进入卵母细胞后能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，到出生周数来决定极早产儿是否接进一步关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假定能发生随机交配和自花而不会成为严重问题为依据。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体，生殖系统适于体内。单起源吸虫（单殖纲）大多是鱼外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目探讨卵细胞第一极体形态与原核期卵形态、卵裂期胚胎质量关系。