why do big cities usually have more problems than small cities?

why do big cities usually have more problems than small cities?
大约200字
英语人气:154 ℃时间:2019-11-06 13:34:03
优质解答
there are more people in the large cities.who will think there are many problems in an area where has no one person?if you live in large city,you will meet more people,there are more relationships,mor...
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