The rural workforce has been flowing in to the cities ever since the open door policy was adopted.
自从改革开放政策实施以来,农付劳动力正不断流向城市。
However, there is an even more insidious kind of pollution that particularly affects urban areas and invades our daily lives, and that is noise.
但是,还有一种更加隐蔽有害的污染,它专门影响城镇地区,侵袭我们的日常生活,那就是噪音。