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白垩系 bái’èxì
oil Cretaceous; Cretaceous system
白垩系常用符号K bái’èxì
geol. Cretaceous
白垩系 bái’èxì
geol. Cretaceous
白垩系
: 8 phrases in 4 subjects
Desert science1
Earth sciences3
General1
Geology3