求翻译：其下再按优势层片优势种的生态习性划分集群。集群下一级是优势度型，它是优势层片的优势种相同或其生态习性一致，并具有相同特征种或标志种的群丛联合，再下即为常绿阔叶林分类的基本单位 — 群丛，其定义是：“层片结构相同，优势层片优势种相同，种类组成基本一致，并具有相同标志种组的群落联合”。由于目前能够得到的完整样地资料不多，多数情况上尚难划分到这一级。兹将中国常绿阔叶林分类系统中的中级单位列表如下:是什么意思？

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