Dyes come from plants or from chemicals.
染料是从植物或化学物质中得来。
These chemicals are practically insoluble in water.
这化学物质几乎不溶于水。
Have you studied the composition of the chemicals?
你研究过这种药品成分了吗?
Semimetallic chemical element, chemical symbol B, atomic number 5.
半金属化学元素，化学符号B，原子序数5。
We put chemicals in test tubes in our chemistry class.
我们上化学课时把化学药品放进试管里。
The fission of the cell could be inhibited with certain chemicals.
细胞可以通过某化学药品加以抑制。
Certain chemicals are easily absorbed into the bloodstream, while others are not.
某化学药品很容易溶于血液, 有则不。
Now scientists have learned to make rain by salting clouds with certain chemicals.
, 科学家已经掌握了把某化学物质撒在云层上以人工造雨方法。
These chemicals make the fruit inedible.
这化学品使这种水果不宜食用。
As chemical reagent and corrodent of integrated plate.
作化学试剂和集成电路电镀板消蚀剂。
The same water was reused after chemical treatment.
原来水经过化学处理之后再度使用。
Chemicals are used to keep the insects down.
化学药品用于阻止昆虫滋生。
Choice having introduced the hammerhead and cleading chemical composition.
介绍了锤头和衬板化学成分选择。
What are the chemical reaction characteristics of tropane alkaloids?
氢溴酸东莨菪碱鉴别原理是什么？
The chemical fertilizer should be well dug in.
化学肥料应该均匀地混入土壤中。
Chemical modification including oxygenation, esterify, graft copolymerization and so on.
化学改性主要有氧化、交联、酯化和接枝共聚。
The chemical must be salted out and allowed to dry.
必须把这种化学物质加盐分离出来并让它干。
The soil has been poisoned with chemical waste from the factory.
土壤被从工厂排出化学废料污染了。
The heat brings about a chemical reaction, and oxygen is liberated.
热量引起化学反应, 释放出氧气。
A catalyst is a substance which speeds up a chemical reaction.
催化剂是一种能加速化学反应物质。
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Asthma attacks can be triggered by pollen, dust, harsh chemicals or scents.
花粉、灰尘、刺激性化物质或气味可引发哮喘。
They analyzed bacteria, fungi, parasites and chemicals.
他们分析了细菌、真菌、寄虫化物质。
It was easy to get the chemicals, but he needed the bodies.
添加剂很易得到，但是没有测试者。
Cigarette smoke contains 69 chemicals that are known to cause cancer.
香烟含有69种致癌化物质。
It also generates reactive chemicals that attack the microbes from within.
它还能产活性化物质，这种化物质能从内部攻击微物。
There are two important chemicals found in all our brains - dopamine and acetylcholine.
多巴胺乙酰胆碱。
For bioluminescence, creatures require two unique chemicals.
为了物发光，物需要两种独特的化物质。
Now, how did you discover these chemicals?
你们是怎样发现化品？
Carrying the hurt or anger of an offense leads the body to release stress chemicals.
满怀冒犯后的伤害或愤怒会导致身体释放压力化物质。
Never use harsh chemicals that can discolor the boot.
千万不要使用强效化物质，以免靴子褪色。
They like the chemicals from a person's body.
它们喜欢人体中的化物质。
A train derailment earlier this month spilled toxic chemicals.
本月早些候，一列火车脱轨，泄漏了有毒化物质。
What's the plants' motivation for producing such chemicals?
那么植物制造这样一种化物质是何缘由呢?
The two vessels were carrying toxic chemicals and jet fuel.
这两艘船载有有毒化品航空燃料。
Before long, his father allowed him to handle the chemicals himself.
不久，他父亲允许他自己处理化品。
They process these chemicals slower, which makes the effects much stronger.
它们处理这些化物质的速度较慢，这使得其效果更强。
Scientists believe there might be such chemicals lying at the bottom of Europa's ocean.
科家认为木卫二地表下的海床上一定存在这些化物质。
These ozone-destroying chemicals are used in aerosol sprays on Earth.
这种能够破坏臭氧层的化物质在地球上用于气雾喷雾器。
If we mix these two chemicals together, they will form an acid.
如果我们把这两种化物混合在一起，他们会形成酸。
In the fields, farmers use too many chemicals which destroy the soil.
农民在田地里用了太多化品，破坏了土壤。
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