英文: Another dangerous factor is that the water pollution including industrial wastes and poisonous gases which eventually blacken rivers and for
m acid rains.
中文: 另一种危险是水的污染，包括工业废物和有毒气体，这些东西最终会使河流变黑并且形成酸雨。
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英文: Coal contains less energy per unit of weight than natural gas or oil it is difficult to transport, and it is associated with a host of environmental issues, among the
m acid rain.
中文: 煤的单位能量含量低于石油和天然气，而且会导致包括酸雨在内的一系列环境问题。
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