...perceivedexertion during a 1-h vacuuming task with a backpack vacuumcleaner and an upright vacuum cleaner. 比較背包式吸塵器，以及直立式吸塵器在一個小時的吸塵作業後，它的工作效率...
用吸塵器吸地毯, 稱為vacuum cleaning. 而吸塵器則稱為vacuum cleaner.
...of devices 2014-04-21 00:10:16 補充： master AP. I mean the vacuum cleaner by itself without referring to other equipments of devices...