我主要讨论这一概念是因为我发现许多人没能掌握序列图的根本灵活性，而分化成直觉和形态使用这两个极端。
I have focused on this concept because I've found that many people fail to grasp the ultimate flexibility of sequence diagrams, and become polarized in their perception and use of the form.
序列图的第二种形态是实例形态。
常规形态的序列图描述初始刺激因素所产生的类交互。
The generic form of a sequence diagram describes the interaction of classes as the result of an initial stimulus.
应用推荐