下雨使空气变得清新了。
这个地方的空气，在春天和初夏都非常清新，而现在却变得呆滞和使人困倦了。
The air of the place, so fresh in the spring and early summer, was stagnant and enervating now.
有了更多的树和草地，空气也变得清新了。
The air there has become more fresher with more trees and grass.
空气质量不如以前那么清新了，河流也变得很脏。
The quality of air isn't clean as before. The river is becoming dirty.
空气质量不如以前那么清新了，河流也变得很脏。
The quality of air isn't clean as before. The river is becoming dirty.
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