vacuum
vacuum 英 [ˈvækjuəm] 美 [ˈvækjuəm]
n. 真空；空间；真空吸尘器 adj. 真空的；利用真空的；产生真空的 vt. 用真空吸尘器清扫
进行时:vacuuming 过去式:vacuumed 过去分词:vacuumed 第三人称单数:vacuums 名词复数:vacuums
- A vacuum is essentially a great lack of something — a place where virtually all matter, even air, has been removed. It can describe something that's literally empty — or something that just seems that way, like a political vacuum.
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- n. 真空；空间；真空吸尘器
- adj. 真空的；利用真空的；产生真空的
- vt. 用真空吸尘器清扫
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1. There is the permittivity vacuum. It is all up there.
这儿还有真空中的介电常数，看，全在这里。
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2. In semiconductor receivers transistors take the place of vacuum tubes.
在半导体收音机中晶体管代替了真空管。
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3. And, while I hesitate to give advice at the end of the piece about how advice should not be in a vacuum: You usually get in life what you expect to get. So expect good advice.
在最后一段，我犹豫是否给出关于建议不能在真空里得到的建议，生命里你会得到你期待得到的，所以期待好的建议和美好的吻，然后他们就会到来。
- 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," from PIE *wak-, extended form of root *eue- "to leave, abandon, give out." Properly a loan-translation of Greek kenon, literally "that which is empty."
- vacuum (v.) "to clean with a vacuum cleaner," 1919, from vacuum (n.). Related: Vacuumed; vacuuming.
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