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地层年代
eng.geol. chronologic age
geol. chronological age
tech. stratigraphic time unit; stratigraphical time unit
地层年代表
dril. chronological time
地 层年代: 41 phrases in 9 subjects
Agriculture1
Desert science2
Drilling1
Earth sciences2
Engineering geology4
General2
Geology6
Oil / petroleum13
Technology10

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