[模型定义](%E6%A8%A1%E5%9E%8B%E5%AE%9A%E4%B9%89.md) [模型观察者](%E6%A8%A1%E5%9E%8B%E8%A7%82%E5%AF%9F%E8%80%85.md) [模型授权](%E6%A8%A1%E5%9E%8B%E6%8E%88%E6%9D%83.md)