biotic formation
英
美
- 生物群系
双语例句
- Associations differed from one another in response to climatic differences within the region of the formation.
群众之间的差异反映了在群系分布范围内的气候的差异。 - Periods of volcanism are indicated by the presence of pyroclastic material in the formation.
群系中火成碎屑物的存在表明了火山酌的形成年代。
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