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-现代词典

单词	sand jack
释义	WordReference Random House Unabridged Dictionary of American English © 2024 sand′ jack′, [Shipbuilding.] Nautical, Naval Termsany of a number of containers of sand driven beneath a hull about to be launched as a temporary support and then drained of sand so as to let the hull down onto the launching cradle.
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