慢速英语:戴森计划在2020年前推出电动汽车

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vacuum – n. electrical device used to clean floors by sucking up dust, dirt, etc.

innovative – adj. using new methods or ideas

blade – n. a flat spinning part used on some machines to push air or water

fierce – adj. strong, powerful

confidential – adj. secret or private

expensive – adj. costing a lot of money