secondary source of pollution
... secondary signal 副信号 secondary source of pollution 次污染源 secondary standard 副标准 ...
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作为空气污染的主要来源之一，易挥发有机物(VOCS)不仅是一次污染源而且还可能造成光化学烟雾等二次污染。
Volatile Organic Compounds (VOCS), as one of the major sources of air contaminations, can not only cause direct pollution, but also lead to secondary pollution, such as photochemistry smog.
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