pipe down

例句：

1. 1. Please pipedown and listen to me, please.
   请压低声音，听我说话。
2. 2. The crowdwas so loud that itwas hard for her to pipedown.
   人群太吵了，她很难保持安静。
3. 3. The angry man couldn'tresist the urge to pipe down and apologize.
   愤怒的男人忍不住想要道歉。