英语词汇“bell 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	bell purchase
释义	WordReference Random House Unabridged Dictionary of American English © 2024 Bell′ pur′chase, Mechanicsa tackle consisting of two standing single blocks, two running single blocks, a fall, and a runner, so arranged that it gives a mechanical advantage of six, neglecting friction. `Also, Bell's′ pur′chase.`
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