He shows complete mastery of his chosen subject.

他精通自己选择那门。

Many of the subjects a prospective hotelman studies are in the field of business administration.

有志于当旅馆经理人所多属于业务管理范围。

Three subjects must be taken, viz., English, mathematice and history.

三个是必修, 英文, 数和历史。

An encyclopedia covers many subjects.

百全书内容涉及许多。

Detail! For inspection—port arms!.

！检阅——斜持枪！。