He shows complete mastery of his chosen subject.

他精选择的那门科目。

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

有志于当旅馆经理的人所学的科目多属于业务管理的范围。

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

三个科目是必修的, 英文, 数学和历史。

An encyclopedia covers many subjects.

百科全书的内容涉及许多科目。

Detail! For inspection—port arms!.

科目！检阅——斜持枪！。