请在评论中来分享你们对于这个模型的看法。
Jenn对于这个模型有一些让人感兴趣的关注，我读完之后也做如是想。
Jenn had some interesting concerns about the model, and now that I have read it, so do I.
本节展示如何使用一个物理模型及其对象来实现这个目标——对于逻辑模型也可以使用类似的方法。
This section shows you how to do this using a physical model and its objects. A similar approach can be used for logical models as well.
应用推荐