2 sentences

1. 这块金属板被撞了一次，中间凹下去了一块。

   zhè kuài jīn​shǔ​bǎn bèi zhuàng le yī cì, zhōng​jiān āo xià​qù le yī kuài.

   The metal plate was hit once, and a section in the middle got dented.

   Source: Dong Chinese Dictionary

2. 由于表面磨得平滑，金属板上映出了灯火的亮光。

   yóu​yú biǎo​miàn mó de píng​huá, jīn​shǔ​bǎn shàng yìng chū le dēng​huǒ de liàng​guāng.

   Because the surface was polished smooth, the metal plate reflected the light of the lamps.

   Source: Dong Chinese Dictionary