The farmers shouldn't use so heavy chemicals in their products.农民们在庄稼上不应使用大量的化学药品。

［词源］＜中古拉丁语alchamy(炼金术)

用作定语
▲～+n.
He is a chemical doctor.他是一位化学博士。
The chemical change takes place in paper when it burns.纸燃烧时会产生化学变化。