In a word, the air quality can be improved gradually if we take more effective measures.

总之，如果我们采取有效措施，空气质量一定可以逐步提高。

youdao

In a word, the air quality can be improved gradually if we take more effective measures.

总之，如果我们采取有效措施，空气质量一定可以逐步提高。

youdao