1. These chemicals are practically insoluble in water.
   这些化学物质几乎不溶于水。
2. Dyes come from plants or from chemicals.
   染料是从植物或化学物质中得来的。
3. Have you studied the composition of the chemicals?
   你研究过这种药品的成分了吗?
4. Semimetallic chemical element, chemical symbol B, atomic number 5.
   半金属的化学元素，化学符号B，原子序数5。
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。
6. The fission of the cell could be inhibited with certain chemicals.
   细胞的裂变可以通过某些化学药品加以抑制。
7. Certain chemicals are easily absorbed into the bloodstream, while others are not.
   某些化学药品很容易溶于血液, 有些则不行。
8. Now scientists have learned to make rain by salting clouds with certain chemicals.
   如今, 科学家已经掌握了把某些化学物质撒在云层上以人工造雨的方法。
9. These chemicals make the fruit inedible.
   这些化学品使这种水果不宜食用。
10. As chemical reagent and corrodent of integrated plate.
    作化学试剂和集成电路电镀板的消蚀剂。
11. The same water was reused after chemical treatment.
    原来的水经过化学处理之后再度使用。
12. Chemicals are used to keep the insects down.
    化学药品用于阻止昆虫滋生。
13. What are the chemical reaction characteristics of tropane alkaloids?
    氢溴酸东莨菪碱的鉴别原理是什么？
14. Choice having introduced the hammerhead and cleading chemical composition.
    介绍了锤头和衬板化学成分的选择。
15. The chemical fertilizer should be well dug in.
    化学肥料应该均匀地混入土壤中。
16. 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。
17. 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变干。
18. The heat brings about a chemical reaction, and oxygen is liberated.
    热量引起化学反应, 释放出氧气。
19. A catalyst is a substance which speeds up a chemical reaction.
    催化剂是一种能加速化学反应的物质。
20. Chemicals in the body break our food down into useful substances.
    人体中的化学元素把食物分解成有用的物质。

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