Fertilization is external, producing free-living planula larva.

体外受精，能产生自由活动的浮。

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。

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

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

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利长期定位试验研究了施肥对黑土有机无机复合及腐殖质结合形态的影响。

Fertilization is external, producing free-living planula larva.

体外，能产生自由活动的浮浪幼虫。

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。

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。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施肥对黑土有机无机复合及腐殖质结合形态的影响。

Fertilization is external, producing free-living planula larva.

体外精，能产生自由活动浮浪幼虫。

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，精到出生周数来决定极早产儿是否接进一注。

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，生殖系统适于体内精。单起源吸虫（单殖纲）大多是鱼外寄生虫。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施肥对黑土有机无机复合及腐殖质结合形态影响。

Fertilization is external, producing free-living planula larva.

体外精，能产生自由活动的浮浪幼虫。

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一步的关注。

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。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施对黑土有机无机复合及腐殖质结合形态的影响。

Fertilization is external, producing free-living planula larva.

体外受精，能产生自由活动的浮浪幼虫。

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

传上，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。

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，生适于体内受精。单起源的吸虫（单纲）大多是鱼的外寄生虫。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施肥对黑土有机无机复合及腐质结合形态的影响。

Fertilization is external, producing free-living planula larva.

体外受精，能产自由活动的浮浪幼虫。

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，医们用孕龄，受精到出的周数来决定极早产儿是否接受进一步的关注。

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，统适于体内受精。单起源的吸虫（单纲）大多是鱼的外寄虫。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施肥对黑土有机无机复合及腐质结合形态的影响。

Fertilization is external, producing free-living planula larva.

体外受精，能自由活动的浮浪幼虫。

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，医们用孕龄，受精到出的周数来决定极是否接受进一步的关注。

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，殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的外寄虫。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施肥对黑土有机无机复合及腐殖质结合形态的影响。

Fertilization is external, producing free-living planula larva.

体外，能产生自由活动的浮浪幼虫。

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。

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。源的吸虫（殖纲）大多是鱼的外寄生虫。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施肥对黑土有机无机复合及腐殖质结合形态的影响。

Fertilization is external, producing free-living planula larva.

体外受，能产生自由活动浮浪幼虫。

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，受到出生周数来决定极早产儿是否接受进一步关注。

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，生殖系统适于体内受。单起虫（单殖纲）大多是鱼外寄生虫。

A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.

摘要利用长期定位试验研究了施肥对黑土有机无机复合及腐殖质结合形态影响。