earphone [ˈɪrˌfon]

例句:

• An operator wearing earphone was sitting in the telephone exchange.
  戴耳机的接线员正坐在总机室里.
  
• No problem. Here is your earphone.
  没问题. 这是给您的耳机.
  
• There's an earphone attached to it.
  还附带一个耳机.