前一个polluted为过去分词,属定语从句中的谓语,后一个为过去式,属主句的谓语.句意为:曾被污染的那条河污染了另一条河。
山西第二大河、唯一的一条无污染河流——沁河，纵贯境内109公里。
The second river in Shanxi Province, the only non-polluting a river - Qinhe, 109 kilometers north-south borders.
伦敦的泰晤士河曾因污染而变成了一条无生命的河流并引发了霍乱等疾病。而现在，它已经是欧洲最洁净的河流之一。
The Thames had been polluted for fifty three years before its cleaning-up, while (polluted) Yangtze River has only waited for twenty years for pollution control, at the most.
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