2 sentences

1. 长江中游的水流相对比较平缓。

   Cháng Jiāng zhōng​yóu de shuǐ​liú xiāng​duì bǐ​jiào píng​huǎn.

   The current in the middle reaches of the Yangtze River is relatively gentle.

   Source: Dong Chinese Dictionary

2. 他在班里的成绩一直处于中游。

   tā zài bān lǐ de chéng​jì yī​zhí chǔ​yú zhōng​yóu.

   His grades in class have always been in the middle range.

   Source: Dong Chinese Dictionary