电话听筒

例句：

1. 1. The old man uses ahearing aid to hear the TV news.
   老人使用助听器来听电视新闻。
2. 2. The teacherasked the students to raise their hands whenthey understood the lesson.
   老师要求学生在理解课程内容时举手。
3. 3. Theengineer used a phone tocall his friend for help.
   工程师用电话联系朋友寻求帮助。