英语词汇“tunnel set”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	tunnel set
释义	tunnel set tunnel set [′tən·əl ‚set] (mining engineering) Timbers 6 to 8 inches (15 to 20 centimeters) in diameter and of sufficient height to support the roof of the tunnel.
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