As the world steps up production, "We have to protect the water and air quality.
随着全球粮食产量的提高，“我们必须保护好水和空气质量。
We are taking steps to prevent stream and air pollution.
我们正采取措施防止河流和空气污染。
The question is what steps we should take to control air pollution.
问题是什么样的措施该采取，以防止大气污染。
The question is what steps we should take to control air pollution.
问题是什么样的措施该采取，以防止大气污染。
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