It is common during integration for interfaces to return unexpected results or to have a sequence of dependent calls from one service to another that requires a level of orchestration.
在接口集成期间经常会返回意外结果，或者服务到服务之间出现一系列依赖调用，这需要对调用进行编排。
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The UML sequence Diagram view presents a sequence of causal dependent events, where events are defined as method entries and exits, as well as outbound calls and return calls (see Figure 20).