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annual mean
ecol.	年平均
el.	年平均值
eng.geol.	年平均值
genet.	年平均数
tech.	年平均量

annual mean: 138 phrases in 21 subjects

Agriculture	6
Animal husbandry	4
Architecture	1
Automobiles	2
Bridge construction	5
Business	5
Desert science	4
Earth sciences	9
Ecology	2
Economy	4
Engineering geology	3
Hydroelectric power stations	13
Hydrology	2
International trade	1
Metallurgy	4
Rail transport	1
Refrigeration	1
Statistics	1
Technology	60
Textile industry	2
Wind Energy	8