He acted as secretary to the board.

他充任委员会秘书。

He occupies an important position in the Ministry of Education.

他在教育部充任要职。

A newly-devised microcomputer can act as a guide to a blind person.

一种新设计微型计算机能够充任向导。

This girl acted as our guide.

这女孩子充任我们向导。

Then the aspiring reporter may break into newspaper work as a copyboy， running errands and helping staff reporters.

有抱负通讯员开始可去当送，跑腿，或充任正式助手，以闯进新闻工作圈子。