决定哪些内容是或者不是体系结构中的一部分，看上去有明确的界线，但是这种分离是很重要的，它允许我们管理软件模型的复杂性。
It may seem like a fine line to decide what is and what is not part of the architecture, but this separation is important in allowing us to manage the complexity of the software models.
照片中可见激波、分离线、再附线等分界线位置。
The fin shock, the separation line and the reattachment line can be identified.
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