But it also spreads out the risk of pollution over a very long period.
但是这样一来也大大延长了可能造成污染的时间。
Worsening air pollution is a risk.
恶化空气污染程度就是其中一个缺点。
Few data on air pollution exposure and risk of venous thrombosis are available.
但是关于空气污染与静脉血栓关系的数据却很有限。
The air pollution is not a very strong risk factor individually on someone's life.
空气污染对个人的生活并不是很强的风险因素。
Pollution has become a global issue, at great risk to human beings, animals and plants.
污染已成为全球问题，对人类动物，植物有很大危害。
Pollution has become a global issue, at great risk to human beings, animals and plants.
污染已成为全球问题，对人类动物，植物有很大危害。
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