小宝贝真紧校园强h_二区免费视频_91免费视_九一精品一区_69热国产视频_在线免费看毛片

单词
vacuum
英 ['v?kj??m] 美['v?kj??m]
基本信息
  • 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
CET4TEM4IELTS考研TOEFLCET6中低频词常用词汇

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;

中文词源

vacuum 真空

词源同vacant,空着的,用于指真空。

英文词源

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]

双语例句

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。

来自柯林斯例句

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。

来自柯林斯例句

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。

来自柯林斯例句

4. He could hear the whirr of a vacuum cleaner.
他能听到真空吸尘器的嗡嗡声。

来自柯林斯例句

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。

来自柯林斯例句

vacuum相关单词
主站蜘蛛池模板: 一区二区三区高清视频在线观看 | 秋霞鲁丝片一区二区三区 | 深夜免费福利视频在线播放 | 久热re国产手机在线观看 | 一级毛片免费视频 | 色老久久精品偷偷鲁一区 | 久久久久成人精品一区二区 | 欧美一级视频免费看 | 天天看夜夜操 | 未满十八勿入av网免费 | 青青久久| 成人久久18免费网站 | 无码丰满熟妇 | 俺去啦最新地址 | 91-69蝌蚪| 久草资源在线 | 永久网址:fb000.xyz | 日韩精品久久久肉伦网站 | 欧美色图另类小说 | 99国产精品热久久久久久 | 人妻熟女一二三区夜夜爱 | 国产无遮挡又黄又爽在线观看 | 欧美成人精品一级高清片 | 一区视频在线 | 人禽l交免费视频观看 视频 | 亚洲日韩色图 | 国产亚洲一级精品久久 | 亚洲熟妇无码另类久久久 | 亚洲精品天堂成人片av在线播放 | 一级特黄特黄毛片欧美的 | 激情欧美一区二区三区中文字幕 | 日本强好片久久久久久aaa | 久久和欧洲码一码二码三码 | 国产成人久久精品推最新 | 黄免费看 | 婷婷综合国产激情在线 | 自愉自愉产区二十四区 | 女人被狂躁高潮啊的视频在线看 | 内谢少妇xxxxx8老少交 | 久久无码高潮喷水 | a毛片免费观看 |