Itjustmaybetheworld’smostcostlyvacuumcleaner(吸塵器).Thepr...
問題詳情：Itjustmaybetheworld’smostcostlyvacuumcleaner(吸塵器).ThepriceofCleanSpaceOneiselevenmilliondollars.Butyet,ithasabigjobtodo.Recently,researchersinSwitzerlandsaidtheyplannedtobuildthisnewcleani...