vacuum是什么意思_vacuum怎么读_中英文释义(含例句用法)

vacuum (v.): "to clean with a vacuum cleaner," 1919, from vacuum (n.). Related: Vacuumed; vacuuming.
vacuum (n.): 1540s, "emptiness of space," from Latin vacuum "an empty space, vacant place, a void," noun use of neuter of vacuus "empty, unoccupied, devoid of," figuratively "free, unoccupied," related to vacare "be empty" (see vain). Properly a loan-translation of Greek kenon, literally "that which is empty." Meaning "a space emptied of air" is attested from 1650s. Vacuum tube "glass thermionic device" is attested from 1859. Vacuum cleaner is from 1903; shortened form vacuum (n.) first recorded 1910.
The metaphysicians of Elea, Parmenides and Melissus, started the notion that a vacuum was impossible, and this became a favorite doctrine with Aristotle. All the scholastics upheld the maxim that "nature abhors a vacuum." [Century Dictionary]

词态变化

复数 vacua;
第三人称单数 vacuums;
过去式 vacuumed;
过去分词 vaccumed;
现在分词 vacuuming;
WWW.wENTiyi.cOM

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。

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。

gap

void

hot vacuum 热真空

imperfect vacuum 部分真空

manifold vacuum 歧管真空

vacuum headache 【医】真空性头痛(额窦口阻塞所致)

vacuum plates 【医】真空腔牙托板

vacuum tubes 【医】真空管

vacuum ventilation 【医】真空通风(抽出式机械通风)

preliminary vacuum 初期减压

pull of vacuum 真空吸力

soft vacuum 低真空

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