单词：biotic formation
biotic formation的用法和样例：
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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英语词组对话
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赖世雄进阶英语词汇3500