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奥陶纪 àotáojì
desert. Ordovician (系)
hydroel.st. Ordovician period; Ordovician
tech. Ordovician (period)
奥陶纪 àotáojì
agric. Ordovician; Ordovician period
geol. Ordovician period (system)
hydroel.st. Ordovician period system B
奥陶纪 àotáojì
gen. Ordovician
奥陶纪 àotáojì
eng.geol. Ordovician
奥陶纪 àotáojì
geol. Ordovician
奥陶纪: 24 phrases in 8 subjects
Desert science3
Drilling1
Earth sciences6
General1
Geology1
Hydroelectric power stations3
Oil / petroleum1
Technology8