UML中类图实例接口：空心圆+直线（唐老鸭类实现了‘讲人话’）；依赖：虚线+箭头（动物和空气的关

Title: UML中类图实例

Description: UML中类图实例接口：空心圆+直线（唐老鸭类实现了‘讲人话’）；依赖：虚线+箭头（动物和空气的关系）；关联：实线+箭头（企鹅需要知道气候才迁移）；聚合：空心四边形+实线+箭头（雁群和大雁的关系）；合成/组合：实心四边形+实线+箭头

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