“open timbering”的概念、定义、翻译、参考文献-科学参考

单词	open timbering
释义	open timbering [`ō·pǝn `tim·bǝ·riŋ] ^{MINING ENGINEERING} A method of supporting the ground in a mine shaft or tunnel; supports are several feet apart, with the ground between them secured by struts.
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