You can't work with an average, squashing together the way heat radiation goes through the dense, warm, humid lower atmosphere with the way it goes through the thin, cold, dry upper atmosphere.

通过平均法计算是行不通的，即不能将热力在密实、温暖、潮湿的底层大气层中辐射的方式，与在稀薄、寒冷、干燥的上层大气层中的辐射方式混为一谈。

youdao

But in China, hydropower dams on the Lancang (upper Mekong) will operate to store part of the monsoon flow and release it during the dry season.

ECONOMIST: Letters