Second, we must reduce emissions of waste and reduce environmental pollution in cities.
第二，我们必须要减少各种垃圾的排放量，减少对城市环境的污染。
This "second" article refers to the inheriting section of the "first" one, it firstly introduces six kinds of active measures to reduce harmonics pollution;
本文“二谈”系“一谈”的继篇，首先介绍了减小谐波污染的六类主动措施；
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