The rapid expansion of cities can cause social and economic problems, such as pollution and traffic problems.
城市的快速发展可能引起社会和经济问题，比如污染和交通问题。
Exhaust gases from boilers, vehicles, etc., cause air pollution in cities.
锅炉和车辆等排出的废气，污染城市空气。
Noise Pollution We know the sounds of cities are loud enough to cause great harm to people's hearing in the u.
噪音污染众所周知，在美国，城市巨大的噪音对人们的听力造成了极大的损害。
Noise Pollution We know the sounds of cities are loud enough to cause great harm to people's hearing in the u.
噪音污染众所周知，在美国，城市巨大的噪音对人们的听力造成了极大的损害。
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