“hourglass”的概念、定义、翻译、参考文献-科学参考

单词	hourglass
释义	hourglass [`au̇r´glas] ^HOROLOGY An instrument for measuring time, consisting of two somewhat funnel-shaped vessels joined at their narrow points by a thin, hollow neck; one hour is required for a given quantity of sand to fall from the upper to the lower vessel.
随便看	symmetric ripple mark open traverse open tuberculosis open tubular column open universe open valley open water open-web girder open well open-window unit open wire open-wire carrier system open-wire feeder open-wire loop open-wire transmission line open workings opera glasses operand operand-precision register operant conditioning operate time operating angle operating characteristic curve operating delay operating handle

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