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单词 superhard
释义

superhard

adjective

su·​per·​hard ˌsü-pər-ˈhärd How to pronounce superhard (audio)
: extremely hard
One way to achieve such a high pressure … is to squeeze a sample between two superhard surfaces. William J. Nellis

Word History

First Known Use

1891, in the meaning defined above

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更新时间:2024/12/23 20:20:07