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vac.uum5vAk7jU:mna space from which most or all of the air, gas or other material has been removed or is not present真空Sound waves cannot travel through a vacuum. [C]声波在真空当中无法传播。The main limitation on the life of a light bulb is not the thickness of the filament but the degree of vacuum. [U]决定一个灯泡使用寿命的主要因素不是灯丝的粗细，而是真空度的高低。A vacuum can also be a lack of something.真空般状态;空白;空虚The withdrawal of troops from the area has created a security vacuum which will need to be filled. [C]自从部队撤出之后，那地区就形成了一个需要填补的安全真空。His resignation has left a power/political vacuum (= lack of powerful/political leadership) at the head of the party. [C]他辞职后，该党领袖空缺，留下了一个权力/政治真空。"Composers are often too afraid of being influenced, "Simpson says, "but you can't compose in a vacuum (= kept separate from other people and activities)." [U]辛普森说，“作曲家常常过分害怕受别人影响，但你总不能呆在真空里作曲吧。”A vacuum (cleaner) (Br trademark also hoover or infml vac) is a piece of electrical equipment which sucks dirt from floors and other surfaces.真空吸尘器。An upright vacuum cleaner is one in which the dirt is collected in a vertical part.竖桶式真空吸尘器a (Br) cylinder/(Am) canister vacuum cleaner is one in which the dirt is collected through a long tube into a horizontal cylinder.横筒真空吸尘器.(Br) A vacuum flask (also thermos flask, Br also flask) is a container which keeps hot liquids hot or cold liquids cold and which usually has a lid which can be used as a cup.保温瓶;热水瓶。Something, esp. food, which is vacuum-packed is in a soft container from which the air has been removed in order to make it possible for the contents to be stored for longer.真空包装的。A vacuum pump is a piece of equipment for removing air or gas from a container, creating a vacuum inside.真空泵。
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