熏黑房屋,弄脏河流
Blacken the houses and dirty the rivers
以上为机器翻译结果，长、整句建议使用 人工翻译 。
只是把它看成一种会熏黑房屋，弄脏河流的令人讨厌的东西。
Until recently pollution was regarded as a nuisance that blackened buildings and sullied streams rather than a threat to human health.
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