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A mouthpiece is the part of an instrument, phone, or tool that goes at or near your mouth - like the part of a trumpet you blow into, or the part of an old telephone you spoke into. It can also mean a person or a newspaper that speaks for a group or a powerful person, often not in a very positive way - 'that newspaper is just a mouthpiece for the government,' meaning it only repeats what the government wants people to hear.
（樂器/電話的）吹口、話筒；（引申）代言人、喉舌
組成mouth + piece - the piece that goes at the mouth.
原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
mouthpiecenoun/ˈmaʊθˌpiːs/
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A part of any device that functions in or near the mouth, especially:
- "It's 'Soapy,' talking from somewhere down there," rapped out Nickle, covering the mouthpiece as he spoke back into the room. "Get Joolby if you can, one of you."
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A part of any device that functions in or near the mouth, especially:
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equestrianismhobbieshorsesA part of any device that functions in or near the mouth, especially:
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A mouthguard.
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A spokesman; one who speaks on behalf of someone else.
- The novel's protagonist serves as a mouthpiece for the author's political views.
- Seeming “real” has been the aim since the earliest police procedurals, which began a long tradition of Hollywood productions acting as a mouthpiece for police departments.
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slangA lawyer for the defense.
- The Robber had angrily demanded his mouthpiece and when the lawyer had finally been allowed to get to them they had been automatically sprung.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。