vacuum [ˈvækjuəm]

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n.真空，空间，真空吸尘器；adj.真空的，产生(利用)真空的；v.用吸尘器打扫

a machine which cleans floors and other surfaces by sucking up dust and dirt

Sound waves will not travel through a vacuum. 声波在真空里不能传播。
He sells vacuum cleaners. 他经销真空吸尘器。