共鸣体

例句：

1. 1.The sound waves from the radio are reflectedoff the walls of the room.
   收音机发出的声波在房间的墙壁上反射。
2. 2.The scientist used a resonator tomeasure the frequency of the sound.
   科学家使用了一个共振器来测量声音的频率。
3. 3. Theresonance of the bell is caused by thevibrations of the air inside the chamber.
   钟的共振是由钟腔内空气的振动引起的。