3 sentences

1. 这段旋律包含了一个复杂的回音装饰音。

   zhè duàn xuán​lǜ bāo​hán le yī gè fù​zá de huí​yīn zhuāng​shì yīn.

   This melody contains a complex turn.

   Source: Dong Chinese Dictionary

2. 我等了三天的回音，但他一直没有联系我。

   wǒ děng le sān tiān de huí​yīn, dàn tā yī​zhí méi​yǒu lián​xì wǒ.

   I waited three days for a response, but he never contacted me.

   Source: Dong Chinese Dictionary

3. 在空旷的隧道里说话，可以听到清晰的回音。

   zài kōng​kuàng de suì​dào lǐ shuō​huà, kě​yǐ tīng​dào qīng​xī de huí​yīn.

   In the empty tunnel, you can hear a clear echo when you speak.

   Source: Dong Chinese Dictionary