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词汇
pilot drift
释义
pilot drift
基本
例句
导洞
In many projects, like the Simplon, for example, a small pilot tunnel is 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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更新时间：2026/8/26 5:16:37