mouthpiece for musical instrument

例句：

1. 1. The violinist plays the mouthpiece of a violin.
   小提琴手演奏小提琴的口哨。
2. 2. The singer uses a mouthpiece to control her breathing.
   歌手使用口哨来控制呼吸。
3. 3.The orchestra needs a mouthpiece to play their instruments.
   管弦乐队需要口哨来演奏他们的乐器。