It is especially useful for increasing flow of the lymphatic system.
它对增加淋巴系统的流量特别有帮助。
Generic sequence diagrams make use of conditional logic, which can be useful for describing the alternative flow of events over the course of an interaction.
常规序列图利用了条件逻辑，这对于描述交互过程中事件的可选流程来说很有用处。
Composite activities like flow or sequence are especially useful to specify the actions taken within the event handler.
流或序列之类的组合活动在指定事件处理程序内所进行的操作时尤为有用。
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