单词	micromachine
释义	micromachine noun mi·​cro·​ma·​chine ˌmī-krō-mə-ˈshēn  : a device or machine constructed on a microscopic scale The hardest material, and one of the most chemically inert, diamond is extremely difficult to fabricate into electronic devices or micromachines. Physics Today especially : such a device constructed using the techniques of lithography Unlike the way Swiss watches are made, silicon micromachines are built in one piece and ready to go. Their three-dimensional structures are created by stacking up a series of very thin, carefully detailed layers of silicon, each one deposited directly on the layer before. As a final step, acid etches away the in-between "sacrificial" layers to free the moving parts. Doug Stewart Example Sentences Recent Examples on the Web Self-replicating micromachines (not discussed by Feynman) would unleash the magic of exponential growth, opening a new epoch in engineering. Frank Wilczek, WSJ, 25 Apr. 2018 Word History First Known Use 1971, in the meaning defined above
随便看	the underprivileged the undersigned the understatement of the year the underworld the unemployed the unexpected the uninitiated the uninsured the union the Union Jack the United Nations the universe the unknown the unthinkable the unwashed the upper crust the upper hand the upshot the upstairs the usual the usual suspects the vanguard the Vatican The Villages the Virgin Mary

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