化學(xué)是19世紀(jì)初期最杰出的實(shí)驗(yàn)室科學(xué)。

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

　　該國并未保證禁用化學(xué)武器。

　　The country has not forsworn the use of chemical weapons.

　　河水中的化學(xué)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(xué)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.