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to phrases
pioneer tunnel
construct. 侧辟导峒
eng.geol. 导坑; 导洞; 導坑
hydroel.st. 侧面导洞
tech. 超前小平巷; 超前导洞; 测辟导洞; 隧道导洞
pioneer tunnel: 1 phrase in 1 subject
Technology1