英语词汇“keystone joist”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	keystone joist
释义	WordReference Random House Unabridged Dictionary of American English © 2024 key′stone joist′, Buildinga reinforced-concrete joist with sloping sides and the top wider than the bottom.
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