用米换布

trade rice for cloth

到图书馆去换本书

go to the library to exchange a book

把外币换成人民币

convert foreign currency into renminbi

换衣服

change clothes

换内衣

change underwear

换鞋子

change shoes

换尿布

change a nappy

换汽车零件

change car parts

换车

change vehicle

换发球

vary one's serve

换一换环境

go somewhere for a change of scene

换句话说

in other words

换工作

get a new job

主任换了。

There is a new director.