This year water levels in the middle and lower reaches of the Yangtze are unusually high.

今年长江中下游的水位高得不正常。

《柯林斯英汉双解大词典》

It is important to culture wheat in the middle and lower reaches of Yangtze valley.

长江中下游是我国重要的冬麦区，小麦育种研究有着极其重要的意义。

youdao

There are lots of similarities between the middle and lower reaches of the Han River and Tennessee Valley in natural conditions.

湖北汉江流域中下游在自然条件上与田纳西流域有许多相似之处。

youdao

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