| 词汇 | vacuum |
| 词根词缀 | 词源： 1550, "emptiness of space," from L. vacuum "an empty space, void," noun use of neuter of vacuus "empty," related to vacare "be empty" (see vain). Properly a loan-translation of Gk. xenon, lit. "that which is empty." Meaning "a place emptied of air" is attested from 1652. Vacuum tube is attested from 1859. Vacuum cleaner is from 1903; shortened form vacuum (n.) first recorded 1910. The verb meaning "to clean with a vacuum cleaner" is recorded from 1922. 词根记忆： n. 真空,真空吸尘器A vacuum flask keeps cool drinks cool and hot drinks hot.保温瓶使冷饮保冷,使热饮保温. n. 空虚;真空(vac+uum表名词)[vac,van,void=empty,表示"空"] |
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