污染就是我们为了这个人口过密，过度工业化的星球所付出的代价。
Pollution is the price we pay for over populated, over-industrialized planet.
污染就是我们这个人口过密、过度工业化的星球所付出的代价。
Pollution is the price we pay for an overpopulated, over industrialized planet.
污染就是我们为这个人口过密，过度工业化的星球所付出的代价。
Pollution is the price we pay for an overpopulated, over industrialized planet.
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