英语词汇“sand jack”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	sand jack
释义	sand jack I. noun : a device consisting essentially of a sandbox and a series of plungers for gradually lowering into position a heavy weight (as a bridge section) supported by the plungers by running out the sand below II. noun : bluejack
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