3 sentences

1. 他脸颊凹陷，颧骨突出。

   tā liǎn​jiá āo​xiàn, quán​gǔ tū​chū.

   His cheeks were sunken and his cheek-bones prominent.

   Source: AI Challenger 2017

2. 停在拖车周围的汽车和卡车大多是几十年前的，未油漆和凹陷。

   tíng zài tuō​chē zhōu​wéi de qì​chē hé kǎ​chē dà​duō shì jǐ​shí nián​qián de, wèi yóu​qī hé āo​xiàn.

   Most of the cars and trucks parked around the trailers were decades old, unpainted and dented.

   Source: CCMatrix

3. 他用利刃在棒上刻了一个凹痕。

   tā yòng lì​rèn zài bàng shang kè le yī​ge āo​hén.

   He cut a notch in the stick with a sharp knife.

   Source: UM-Corpus: Spoken