用英语回答：How to keep water clean?Give out one example.

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用英语回答：Howtokeepwaterclean?Giveoutoneexample.用英语回答：Howtokeepwaterclean?Giveoutoneexample.用英语回答：Howtok

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 !

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