| 正面 | 4979.vacuum 英 ['vækjʊəm]美 ['vækjʊəm]     |
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| 背面 |      释义： 1. PIE root *dhreu- "fall, drip, droop" => Old English dreosan (past participle droren) "fall" => Middle English dresen "fall".2. PIE root *dhreu- "fall, drip, droop" => Proto-Germanic *drup- "fall, drop".3. 由此推出同源词：drown; dreary; drizzle, drowsy; drip, drop, droop.4. drink => drown.5. drink => drench.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 例句： 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。 vacuum 真空词源同vacant,空着的，用于指真空。 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]" |