这位讲师每周在礼堂讲授文学史。

The ___lecturer delivers lectures on literary history in the auditorium every week.

他在大学担任讲师，正在为晋升副教授努力。

He works as a ___lecturer at the university and is striving to become an associate professor.

这位讲师用简单的语言解释了复杂的经济学概念。

The ___lecturer explained complex economic concepts in simple terms.