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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
Technology
1
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