vacuity
【词性】：n． 【释义】： 空虚，空洞无物的东西 ‖vacuum［′vkjum］n．真空v．用真空器清扫…vacuum air pump真空泵vacuum augmenter真空增强器vacuum booster真空助力器vacuum emergency valve真空紧急制动阀vacuum flight真空飞行vacuum fuel supply真空供油vacuum gauge真空计vacuum handling真空处理vacuum insulation真空绝热vacuum intensifier真空增强器vacuum regulator真空调节器vacuum state真空状态vacuum treatment真空处理vacuum truck真空油槽车vacuum tube真空管 |