萨克斯管演奏者换了一个新的吹嘴，音色立刻变得更明亮了。

The saxophonist replaced the ___mouthpiece and the tone instantly became brighter.

这位发言人是公司的官方喉舌。

The spokesperson serves as the company's official ___mouthpiece.

这个乐器的吹嘴需要定期清洁。

The ___mouthpiece of this instrument needs regular cleaning.