Pollution from chemical sources such as factories can cause the death of whole ecosystems very quickly.
工厂里排放出来的化学品造成的污染会让整个生态系统迅速崩溃。
And the unloadings from the factories cause great detriment of superposed F pollution.
工厂排污导致的叠加氟污染危害较大，应引起重视。
These factories cause little pollution for the city.
这些工厂造成污染的小城市。
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