英语词汇“pilot tunnel”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	pilot tunnel
释义	pilot tunnel 基本例句导洞 In many projects, like the Simplon, for example, a smallpilot tunnelis driven before the full diameter of the tunnel is excavated.在许多隧道工程中，经如辛普龙大隧道，都要在隧道全面开挖前打一个导洞。
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