chairs
A chair is a piece of furniture for one person to sit on, with a back and four legs.
He rose from his chair and walked to the window.
他从椅子上站起来走到窗户旁。
At a university, a chair is the position or job of professor.
He has been appointed to the chair of sociology.
他受命任职社会学教授。
The person who is the chair of a committee or meeting is the person in charge of it.
She is the chair of the Defence Advisory Committee on Women in the Military.
她是军队女兵国防顾问委员会的主席。
chairs , chairing , chaired
If you chair a meeting or a committee, you are the person in charge of it.
He was about to chair a meeting in Venice of EU foreign ministers.
他将担任威尼斯欧盟外交部长会议的主席 。