3 sentences

1. 鱼在水中游动。

   yú zài shuǐ​zhōng yóu​dòng.

   Fish swim in the water.

   Source: Dong Chinese Dictionary

2. 我们只能在水中受孕和分娩。

   wǒ​men zhǐ néng zài shuǐ​zhōng shòu​yùn hé fēn​miǎn.

   We can only conceive and give birth in the water.

   Source: OpenSubtitles

3. 光线从空气进入水中时会发生折射。

   guāng​xiàn cóng kōng​qì jìn​rù shuǐ​zhōng shí huì fā​shēng zhé​shè.

   Refraction occurs when light enters water from air.

   Source: Dong Chinese Dictionary