The middle reaches of Heihe river is the second largest inland valley in the arid region of northwestern China.

黑河中游是我国西北干旱区开发历史较早，绿洲化程度较高的第二大内陆河流域。

youdao

The wetland in the middle reaches of Yangtze River has been greatly damaged for excess exploitation and unreasonable utilization.

长江中游湿地由于人类对其不合理的开发和利用，遭到了极大的破坏。

youdao

Firewood consumption makes up 30 percent of aggregate timber consumption on the upper-middle reaches of Yangtze and Yellow rivers.

长江、黄河流域上中游地区薪柴消耗约占毁林的30%。

youdao

It would start by addressing the way in which middle-class income is drained off before it ever reaches the middle class.

CNN: A good start to reviving the middle class

This goes on until the student-dodger reaches middle age, when he receives a permanent exemption.

ECONOMIST: Israel

Beginning on the fifth day of the fifth lunar month, people of several ethnic groups throughout China and the world celebrate the Dragon Boat festival, especially in the middle and lower reaches of the Yangtze River.

UNESCO: Culture