英语词汇“twofold purchase”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	twofold purchase
释义	WordReference Random House Unabridged Dictionary of American English © 2024 two′fold pur′chase, [Mach.,]Mech. Mechanical Engineering, Mechanicsa purchase using a double standing block and a double running block so as to give a mechanical advantage of four or five, neglecting friction, depending on whether the hauling is on the standing block or the running block.
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