轻松练外语Unit 7
It's the polite thing to do
- mannersn.礼貌seatn.座位impoliteadj.没有礼貌的in need需要（的时候）asconj.当……的时候linen.队in line排队pushv.推push in插队fulladj.满的
- dishn.盘子;碟子laughv.大笑laugh at嘲笑Help yourself to ...随便吃点……throwv.扔;掉（过去式是threw）
It's the polite thing to do