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原始层{土壤}
agric. initial layer
原始 层
: 50 phrases in 15 subjects
Agriculture7
Artificial intelligence1
Desert science4
Drilling3
Earth sciences1
Engineering geology5
Explosives and Explosive Ordnance Disposal1
Forestry1
General1
Geophysics2
Life sciences4
Mining1
Oil / petroleum8
Reproductive biology1
Technology10