符号的工作方式与此相反；如果第一个命令未成功完成，则执行第二个命令。
The | | symbol works in the opposite way; if the first command does not complete successfully, then execute the second.
当流程在运行过程中出现问题或发生异常情况时，可以使用错误处理程序撤消发生错误的范围中的部分工作或未成功完成的工作。
When a problem or exceptional situation occurs while a process runs, you can use a fault handler to undo partial and unsuccessful work for the scope in which the fault occurred.
当流程在运行过程中出现问题或发生异常情况时，可以使用错误处理程序撤消发生错误的范围中的部分工作或未成功完成的工作。
When a problem or exceptional situation occurs while a process runs, you can use a fault handler to undo partial and unsuccessful work for the scope in which the fault occurred.
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