An example of this is when a service provider accesses multiple back-end systems with different timeout requirements, but only determines at run time which back-end is invoked.
此类示例包括服务提供程序访问多个带有不同超时需求的后端系统，但仅在运行时才确定调用哪个后端系统。
In other words, Figure 2 assumes that the timeout between individual components is always as defined, regardless of which service is invoked, and regardless of the content of each message.
换句话说，图2假设各组件之间的超时总是固定的——无论调用的是哪些服务，无论每条消息的内容是什么。
There are cases when scoping a timeout value to a particular service is not sufficient, and cases when the timeout depends on the content of a message.
在某些情况下，为特定服务调整超时值还不够，在其他一些情况下，超时取决于一条消息的内容。
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