化学是19世纪初期最杰出的.实验室科学。
Chemistry was par excellence the laboratory science of the early nineteenth century.
该国并未保证禁用化学武器。
The country has not forsworn the use of chemical weapons.
河水中的化学物质含量不容忽视。
The levels of chemicals in the river are not insignificant.
空气中弥漫的化学物质熏得我们的眼睛火辣辣地痛。
Our eyes were burning from the chemicals in the air.