单词	jack screw
释义	Jack screw Jack screw A Jack (number 3) with a heavy cast iron base and a large screw that can be turned to raise or lower a load.
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英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。