But urban runoff and septic seepage are not always the main culprits behind microbial pollution.
不过,都市迳流及化粪池的渗漏,并非一直是微生物污染背后的主要凶手.
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The Chinese urban runoff pollution status is introduced as a main part of total pollutant control.
介绍了中国城市径流污染状况,指出径流污染控制应纳入污染物总量控制范畴.
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