英语词汇jackknife ruling pen怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	jackknife ruling pen
释义	jackknife ruling pen 简明释义扳开式鸭嘴笔专业释义 1 机械工程扳开式鸭嘴笔
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英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。