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- 问题详情：TounderstandwhytheEarthiswarmingup,firstofall,weneedtounderstandwhyitiswarm.Ourplanetiscoveredwithatmosphere(大气)ightpassesthroughtheatmosphereandreachestheEarth.TheSunheatsuptheEarth'ssurface.Whentheheatrisesintotheair,itisstoppedbysomespe...
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