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Howwatercyclefrist,thesunshinesthewater,thewaterbecomeshot,thewaterbecomesvapour.thevapourgoesuphigherandhigher,thevapourbecomescloud.thecloudsbecomeheavierandheavier,itbecomesrain.theraindrops.theyarecycle.
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本文标题：How water cycle
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