v 用吸尘器清扫(clean using a vacuum cleaner)[I， T+n， T+n+adv(out)]：(sb) be～ing in the dining-hall(某人)正在餐厅用吸尘器打扫;～the carpet/the stairs/the floor/the room/the house用吸尘器清扫地毯/楼梯/地板/房间/房屋;～the room/the car (out)用吸尘器彻底清理房间/汽车;

n (1)真空 (space which is entirely empty of gas(es) or matter)[C]：a～flask/tube 保温瓶/电子管; a～cleaner/pump 真空吸尘器/泵;create a perfect～创造一种完全真空状态;～-packed 抽出空气密封包装的;

(2)空虚(的感觉);与外界隔绝(的状态)(emptiness;state of isolation from outside influences)[C， 通常sing](fig)：(sb's death) leave a～in one's life(某人的死)使自己生活空虚;live/work in a～在与世隔绝的状况下生活/工作;He was brought up in a～，isolated from the normal world. 他是在与正常世界隔绝的环境里长大的。

(3)真空吸尘器(short form for vacuum cleaner)[C](infml)：～=～cleaner