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第四系 dìsìxì
eng.geol. Quaternary
hydroel.st. Quaternary System
oil Qua ternary system
第四系{土壤} dìsìxì
agric. quaternary system
第四系【纪】 dìsìxì
geol. Quaternary
第四系【地】 dìsìxì
tech. Quaternary system
第四系: 26 phrases in 9 subjects
Agriculture1
Aviation1
Computer networks1
Drilling1
Earth sciences1
Electronics1
Geology1
Hydroelectric power stations2
Technology17