listen in例句

It's rude to listen in on other people's telephone calls.
偷听别人的电话是不礼貌的.

People used to listen in regularly before the days of television.
在电视出现以前,人们经常收听广播.

Did you listen in to the Prime Minister yesterday evening?
你昨晚收听首相的广播讲话了吗 ?