![Astheproverbgoes，manstrugglesupwards；waterflowsdownward...]( "Astheproverbgoes，manstrugglesupwards；waterflowsdownward...")
- 问题详情：Astheproverbgoes，manstrugglesupwards；waterflowsdownwards．Waterrunsdownhillfrommountaintopstostreams，toriversandtooceans．Butdownhillisn'ttheonlywaythatwatermoves．Anewstudymeasureshowwatertravelsfromcountrytocountryforhumanconsumption．Thisflowisn'tt...
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