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二叠纪 èrdiéjì
gen. Dias
agric. Permian (Period)
eng.geol. Dias (Dyas)
hydroel.st. Permian period; Dyas
oil Permian
二叠纪层 èrdiéjì
gen. Dyas
二叠纪的 èrdiéjì
gen. Permian
二叠纪〔系〕 èrdiéjì
earth.sc. Permian
二叠纪系 èrdiéjì
geol. Permian period (system)
二 叠纪: 29 phrases in 9 subjects
Drilling4
Earth sciences7
Engineering geology2
Geology2
Geophysics2
Hydroelectric power stations2
Mining1
Oil / petroleum2
Technology7

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