4 sentences

1. 她用手捂住了电话的话筒。

   tā yòng shǒu wǔ​zhù le diàn​huà de huà​tǒng.

   She covered the mouthpiece of the phone with her hand.

   Source: Tatoeba

2. 他轻轻地放下了话筒，结束了通话。

   tā qīng​qīng de fàng​xià le huà​tǒng, jié​shù le tōng​huà.

   He gently put down the receiver and ended the call.

   Source: Dong Chinese Dictionary

3. 他是该组织在媒体面前的话筒。

   tā shì gāi zǔ​zhī zài méi​tǐ miàn​qián de huà​tǒng.

   He is the spokesperson for the organization to the media.

   Source: Dong Chinese Dictionary

4. 他拿起话筒，开始对台下的观众演讲。

   tā ná​qǐ huà​tǒng, kāi​shǐ duì tái xià de guān​zhòng yǎn​jiǎng.

   He picked up the microphone and began his speech to the audience.

   Source: Dong Chinese Dictionary