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Haveyoueverwondered?(1).Whydoairplanestakelongertoflywe...
问题详情:Haveyoueverwondered?(1)doairplanestakelongertoflywestthaneast?Itcantakefivehourstogowest-eastfromNewYork(NY)toLondonbutsevenhourstotraveleast-westfromLondontoNY.Thereasonforthedifferenceisanatmo...
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Haveyoueverwondered aboutthestars?Insomeways,starsarel...
问题详情: Haveyoueverwondered aboutthestars?Insomeways,starsarelikepeople.Theywereborn(出生).Theygrowoldandtheydie.Astarwasbornfromdust(灰尘)andgas(气体).Slowlythedustandgasmakeaball.Theballgetsveryh...