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 !