...获取搜索建议 统计词频一般用户 ltltincludegtgt 关键词前缀匹配 图 5 用户搜索建议图d 系统序列图（System Sequence Diagrams）系统序列图.
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Because system behavior is the result of objects sending messages to each other, sequence diagrams plot the course of those messages as they move from object to object.
因为系统行为是对象相互之间发送消息的结果，因此序列图绘制了那些消息在对象之间移动时的路线。
Then an object model and sequence diagrams were created for each system.
然后为每个系统创建对象模型和序列图。
In addition to their use in designing new systems, sequence diagrams can be used to document how objects in an existing (call it "legacy") system currently interact.
序列图除了在设计新系统方面的用途外，它们还能用来记录一个存在系统(称它为“遗产”)的对象现在如何交互。
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