“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	shakedown test shakeout shaker shaker conveyor shake table shake-table test shake wave shaking-out shaking screen shaking table shale shale ball shale break shale clay shale crescent shale ice shale naphtha shale oil shale reservoir shale shaker shalification shallot shallow-focus earthquake shallow fog shallow fording

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