作业帮用英语回答：How to keep water clean?Give out one example.
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用英语回答：How to keep water clean?Give out one example.
用英语回答：How to keep water clean?Give out one example.
用英语回答：How to keep water clean?Give out one example.
we should not throw rubbish into river , and we are supposed to save every drop of water , what is more , we must stop factories from pouring waste water into the river !
用英语回答：How to keep water clean?Give out one example.
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初一口语题：用英语回答问题回答问题（不是翻译）：How to keep water clean?Give out one example.
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