megaphone [ˈmegəfoʊn]

例句:

• A megaphone boomed out, "This is the police."
  扩音器响了起来：“我们是警察。”
  
• Making monetary policy by megaphone never leads to good results.
  夸夸其谈的货币政策决不会取得效果.
  
• He hawks with a megaphone, saving a lot of effort.
  他用喇叭筒叫卖, 省劲多了!
  
• One person can have a megaphone and have an opinion.
  来自WSJ
• "Come on, people," he pleaded into a megaphone.
  来自NEWYORKER
• The teacher stood at the other end with a very loud megaphone.
  来自BBC