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to phrases
探洞
el.
exploration tunnel
hydroel.st.
exploratory tunnel
;
exploratory adit
outd.
caving
tech.
exploratory drift
;
exploratory heading
;
investigation hole
;
trial heading
;
trial tunnel
勘
探
导
洞
el.
exploratory heading
探洞:
30 phrases
in 7 subjects
Electronics
1
Engineering geology
4
General
3
Hydroelectric power stations
6
Outdoor activities and extreme sports
2
Sports
2
Technology
12
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