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- 问题详情：Itjustmaybetheworld’smostcostlyvacuumcleaner(吸尘器).ThepriceofCleanSpaceOneiselevenmilliondollars.Butyet,ithasabigjobtodo.Recently,researchersinSwitzerlandsaidtheyplannedtobuildthisnewcleaningmachine.CleanSpaceOnewillnotbeforuseinhomesorbus...
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