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to phrases
井
眼
内
mining.
in hole
井内
:
150 phrases
in 16 subjects
Air defense
1
Desert science
1
Drilling
40
Earth sciences
3
Engineering geology
7
General
3
Geophysics
2
Hydroelectric power stations
1
Mining
7
Navigation
1
Oil / petroleum
39
Pharmacology
1
Rail transport
1
Refrigeration
1
Space
5
Technology
37
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