both

adj 两…(都)，两个…(都)

• Both Mary's parents are teachers. 玛丽的父母都是教师。

• Both books are very useful. 这两本书都很有用。

词组both...and... …和…(两者)都；不仅…而且…，既…又…

• She knows both English and French. 她既懂英语又懂法语。

• He is both teacher and friend to his students. 对于学生来说他既是老师又是朋友。