... pollution criterion 污染标准 pollution cycle 污染循环,污染周期 pollution deposit 污染沉积物 ...
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Unlike auto rickshaws, which burn fuel, cycle rickshaws produce no pollution.
VOA: special.2009.05.11
But again, the more people cycle, the less pollution we have.
但是再次地,人们骑自行车越多,污染就会越少。
Skeptics argue,however, that rising temperatures and warmer oceans are part of a natural cycle and are not convinced the changes are a result of man's pollution.
VOA: standard.2009.05.03
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