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jackscrew n. 螺旋起重機 螺旋起重機 jackscrew n 1: screw-operated jack [synonym: {jackscrew}, {screw jack}] Jackscrew \Jack"screw`\, n.
A jack in which a screw is used for lifting, or exerting pressure. See Illust. of 2d {Jack}, n., 5. [1913 Webster]
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