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gear case, gear lever, gear train, gear wheel, gearbox, gear-box, gearbox-case, gearcase, gearchange, gear-driven,

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扫雷艇, 扫盲, 扫描, 扫描点, 扫描电镜, 扫描电路, 扫描发生器, 扫描码, 扫描盘, 扫描器,