1 sentence

1. 空气中悬浮着许多肉眼看不见的微粒。

   kōng​qì zhōng xuán​fú zhe xǔ​duō ròu​yǎn kàn​bu​jiàn de wēi​lì.

   Many particles invisible to the naked eye are suspended in the air.

   Source: Dong Chinese Dictionary