embed model的用法和样例：
例句
- The hub and spoke model for packaging and deploying resources uses a fallback process to locate appropriate resources.
用于打包和部署资源的轮辐式模型使用后备进程来定位合适的资源。 - The usual manifest model forces her not only to be aware of every intermediate step but to reverse each of them, in turn.
通常的显式模型迫使用户不仅要意识到每一个步骤，而且要依次恢复每一个动作。
