n
1 part of a musical instrument, pipe, telephone, etc that is placed at or between the lips （乐器的）吹口; （烟斗的）咬嘴; （电话的）送话口. =>illus at App
1 见附录1插图, page x.
2 (usu derog 通常作贬义) person, newspaper, etc that expresses the opinions of others 代言人; 喉舌
*a newspaper which is merely the mouthpiece of the Tory party 仅为英国保守党喉舌的报纸.

n[C]
mouthpiece, valve
the part of a musical instrument, telephone etc that you put in your mouth or next to your mouth
　Ben put his hand over the mouthpiece and shouted to me.
[usually singular]
a person, newspaper etc that expresses the opinions of a government or a political organization
mouthpiece of
　The newspaper was the mouthpiece of the National Democratic Party.