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平土 píngtǔ
soil.	grade
tech.	grading

平土: 433 phrases in 30 subjects

Agriculture	28
Arabic language	2
Architecture	8
Bridge construction	15
Commerce	1
Construction	4
Desert science	17
Drilling	2
Earth sciences	10
Ecology	5
Economy	1
Electronics	7
Engineering geology	11
Explosives and Explosive Ordnance Disposal	1
General	2
Hydraulics	2
Hydroelectric power stations	19
Hydrology	1
Metallurgy	3
Navigation	2
Oil / petroleum	8
Project management	3
Rail transport	2
Socialism	1
Soil science	3
Space	1
Technology	263
Textile industry	8
United Nations	1
Water resources	2