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地层顶部
 地层顶部
geol. top of a formation
| 岩石
 岩石
arabic desert. hadjar
desert. chalym; cholu; gang; gibber; pena
environ. rock
geol. rocks
hydroel.st. rock

to phrases
地层顶部
geol. top of a formation
地层顶部
: 3 phrases in 2 subjects
Geology2
Geophysics1