微污染水源水
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lightly-polluted water 微污染水
water polluted lightly
轻度污染的水
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They have come up with two sorts, one for heavily polluted water and one for water that is only lightly polluted.
他们已经发现了两种光活性催化剂，一种用于净化严重污染的水，一种用于净化轻度污染的水。
youdao
China's lakes, rivers and underground water supplies have all been badly polluted by lightly regulated industry.
BBC: Beijing smog: When growth trumps life in China
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