也有其它可能的程序流：举例来说，用来直接将用户送到产品列表的链接可以被加到主菜单中。
Other program flows are possible: for example, a link could be added to the main menu that sends the user directly to the item list.
举例来说，联邦法官被授予对那些有罪犯人的判刑决策权，但他们经常受到判刑指导原则的约束。
For example, federal judges are granted decision rights for sentencing those convicted of a crime, but they are often constrained by sentencing guidelines.
这暗示一个请求的响应在用例描述持续情况下，或者被接收，或者不被接收(举例来说，在超时的情况下)。
This implies that a response to a request is either received or not received (e.g., in case of a time out) when the description of the use case continues.
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