... stream pollution 河川污染；河流污染 stream purification 河水净化 stream reaeration 河流再曝气 ...
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stream self-purification 河流自净作用
self-purification of stream 河流自净
limitation to stream self-purification 河流自净的限度
purification of polluted stream 污染河水净化
purification for polluted stream 污染河水净化
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The temple, built in the 9th Century, has 13 ornate spouts, and each stream of cool fresh water represents a different type of purification, from fertility and love to protection from evil spirits.
BBC: Changing lives and perceptions in Ubud
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