overpopulation has caused many problems
... Has Very Many Problems 存在着很多问题 overpopulation has caused many problems 人口过多已经造成了许多问题 Also Has Many Problems 也出现不少问题 ...
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overpopulation has caused many problems
人口过剩造成了许多问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。