空气清洁法实行后40年来，越来越多人呼吸到更加清新的空气。

Forty years after the Clean Air Act, more people are breathing easier.

youdao

空气清洁法实行后40年来，越来越多人呼吸到更加清新的空气。

Forty years after the Clean Air Act, more people are breathing easier.

youdao