vacuum

n. /ˈvækjuːm/ B2

真空；空白；真空吸尘器

A space completely empty of all gas and matter.

仙境例句

The old Tortoise pumped all the air out of the glass, leaving a vacuum inside.

老陆龟把玻璃瓶里的空气全抽了出来，瓶里成了真空。