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- 问题详情：WhentheAudetfamilyturnsonthelightsatBlueFarm,theyareusingelectricitythatcomesfromcows—cowmanure(粪肥),tobespecific.Cowsproducealotofwastes.Onecowcancreate30gallonsofwasteseachday.Nowimaginetheoutputofover1,000cowsatBlueFarm.That’sreallyabig...
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