Whereas the traditional er model has an even and balanced style of entities and complex relationships among entities, the star model is very asymmetric.
传统的ER模型具有均匀且平衡的实体样式和实体之间的复杂关系，而星型模型却是完全不对称的。
Whereas the traditional er model has an even and balanced style of entities and complex relationships among entities, the star model is very asymmetric.
传统的ER模型具有均匀且平衡的实体样式和实体之间的复杂关系，而星型模型却是完全不对称的。
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