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单词 pump-down
释义

pump-down

/ˈpʌmpˌdaʊn/
Mechanics and Engineering
noun
The action or process of reducing the pressure of air or other gas inside an enclosed volume by pumping.

Origin

1940s; earliest use found in Review of Scientific Instruments. From to pump down at pump.

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更新时间:2024/11/11 1:39:00