2 sentences

1. 体温计里装的是水银。

   tǐ​wēn​jì lǐ zhuāng de shì shuǐ​yín.

   The thermometer contains mercury.

   Source: Dong Chinese Dictionary

2. 温度计里的水银柱正在缓慢下降。

   wēn​dù​jì lǐ de shuǐ​yín zhù zhèng​zài huǎn​màn xià jiàng.

   The mercury column in the thermometer is slowly falling.

   Source: Dong Chinese Dictionary