一二次空气污染物是一种有害化学形成了在大气中经过化学反应之间的空气成分。
A secondary air pollutant is a harmful chemical formed in the atmosphere through a chemical reaction among air components.
另一些物质看起来是经过极冷表面的化学反应生成的。
Other minerals look like what is produced by chemical reactions that occur on very cold surfaces.
因此，解决这个问题的最好方法之一，只有利用微生物了。微生物就是一座座完美无缺的微型工厂，如果经过合理设计，所有的化学反应过程都可以在微生物细胞内进行。
One of the best solutions to the drawbacks, therefore, seems to be microbes, which are perfect little factories because they can be engineered to perform practically any chemical reaction.
经过了20年的光阴，旧填充物表面有95%的汞元素已经发生了化学反应，它变成了黑辰砂(beta - mercury sulfide)，一种黑色的固体。
After two decades, 95 percent of the elemental mercury on the surface of a filling had gone through a chemical reaction. It became beta-mercury sulfide, a black-colored solid.
“并不是任意两种化合物都会发生这样的化学反应，经过三十天的艰苦工作，才生产和发现了这样的化学物品。”Amatore说。
"Two of these chemicals do not occur naturally, and would have taken 30 days of hard work to make," Amatore said.
经过一系列复杂的化学反应生成糖类。
After a series of complicated chemical reactions, carbohydrates are formed.
经过第一次简单的化学反应之后随之而来的是还会化学性质上的一系列细微的更复杂的变化。
After that first simple chemical reaction comes a slightly more complicated series of changes in seawater chemistry.
在气化段，炽热的半焦和汽化剂经过还原、氧化等一系列化学反应生成的煤气，称为气化煤气。
In gasification section, hot carbocoal and vaporization agent after reduction, oxidation and so on a series of chemical reactions that produce gas, called sublimation gas.
在气化段，炽热的半焦和汽化剂经过还原、氧化等一系列化学反应生成的煤气，称为气化煤气。
In gasification section, hot carbocoal and vaporization agent after reduction, oxidation and so on a series of chemical reactions that produce gas, called sublimation gas.
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