名词
中文翻译：次级分层
同义词：
['subdivision', 'secondary division']
例句：
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1. The soil is undergoing a process of secondary stratification.
土壤正在经历一个次级分层的过程。
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2. The research team has conducted a study on the secondary stratification of the soil.
研究团队对土壤的次级分层进行了研究。
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3. The city planners are considering implementing a policy that would promote secondary stratification in the urban landscape.
城市规划者正在考虑实施一项政策，以促进城市景观中的次级分层。