化學是19世紀初期最杰出的實驗室科學。

　　Chemistry was par excellence the laboratory science of the early nineteenth century.

　　該國并未保證禁用化學武器。

　　The country has not forsworn the use of chemical weapons.

　　河水中的化學物質(zhì)含量不容忽視。

　　The levels of chemicals in the river are not insignificant.

　　空氣中彌漫的化學物質(zhì)熏得我們的眼睛火辣辣地痛。

　　Our eyes were burning from the chemicals in the air.