mouthpiece
noun [ C ] uk/ˈmaʊθ.piːs/ us/ˈmaʊθ.piːs/
(PIECE OF EQUIPMENT)
（电话的）送话口，话筒；（乐器的）吹口
the part of a phone, musical instrument, or other device that goes near or between the lips
To play the recorder, blow gently into the mouthpiece. 演奏直笛时，要含住吹口舒缓地吹奏。
(PERSON/NEWSPAPER)
disapproving传声筒;代言人;喉舌
a person or a newspaper that only expresses the opinions of one particular organization
This newspaper is just a Republican mouthpiece. 这家报纸只不过是共和党的传声筒。