- 问题详情:Haveyoueverheardof“aballofenergy”?Peopleoftenuseittodescribeveryactivechildren.ButtodaywetellaboutaninventioncalledthesOccket,thatisarealsoccerballofenergy.JuliaSilvermanexplainsthatinfactthesOccketisaportablegenerator(便携式发电机).JuliaSilv...
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