n. 真空；空白；空虚；清洁
v. 用真空吸尘器清扫；
用作名词(n.)
Sound waves cannot travel through a vacuum.
声波不能在真空中传播。
I mean to buy a vacuum next month.
下个月我打算买一台真空吸尘器。
His resignation has left a power vacuum at the head of the party.
他的辞职使得该党的领导位置出现了权力真空。
1. The Marshal stepped over the vacuum-cleaner and stumped out of the room.
元帅迈过真空吸尘器，脚步沉重地走出了房间。
2. Vacuum-packed ham slices should be unwrapped 30 minutes before serving.
真空包装的火腿片应在食用前30分钟把包装除去。
3. The collapse of the army left a vacuum in the area.
这支军队的溃败使这个地区出现了军事真空。
4. He could hear the whirr of a vacuum cleaner.
他能听到真空吸尘器的嗡嗡声。
5. We lived in a vacuum — no life, no news, no books.
我们生活在与世隔绝的环境里——没有其他生物，收不到外界消息，也没有书看。
6. The vacuum flask has a strong casing, which won't crack or chip.
这种热水瓶瓶身坚固，不易断裂破碎。