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地下井 dìxiàjǐng
space underground silo; cell
地下井: 80 phrases in 18 subjects
Architecture3
Aviation1
Desert science1
Drilling4
Earth sciences2
Electronics3
Engineering geology3
General2
Geophysics8
Hydroelectric power stations2
Mechanics1
Military1
Mining1
Navigation1
Oil / petroleum6
Space12
Technology28
United Nations1