![Itjustmaybetheworld’smostcostlyvacuumcleaner(吸塵器).Thepr...]( "Itjustmaybetheworld’smostcostlyvacuumcleaner(吸塵器).Thepr...")
- 問題詳情：Itjustmaybetheworld’smostcostlyvacuumcleaner(吸塵器).ThepriceofCleanSpaceOneiselevenmilliondollars.Butyet,ithasabigjobtodo.Recently,researchersinSwitzerlandsaidtheyplannedtobuildthisnewcleaningmachine.CleanSpaceOnewillnotbeforuseinhomesorbus...
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