化学系的英文：
Department of Chemistry

A government department or a subdivision of a department.
局司处等行政单位政府部门或其下属机构

He's the departed department leader.
他是过去的部门领导。

The bulk of the work rolls from department to department.
大量的工作从一个部门转移到另一个部门。

The accounting department is independent of all the other departments.
会计部门是独立于其它所有部门的。

depart out of this world
逝世|去世

He is an authority in the region of chemistry.
他是化学界的权威。

Moreover, this is a chemistry thing does.
何况是这种有化学作用的东西呢。

Biology, Chemistry,and Physics are sciences.
生物、化学和物理是自然科学。

You must read standard works on chemistry.
你必须读一下化学方面的权威著作。

In collage I specialize in organic chemistry.
在学院里我主修有机化学。