There might be exceptions to this normal processing such as the handling of invalid orders, dealing with system exceptions, and other issues.
2
这需要人工解决，例如允许处理无效的订单，以及由系统管理员来解决工作流程中的系统异常问题。
This requires human involvement with varying roles, such as approvers to handle invalid orders and system administrators to deal with system exceptions in the workflow process.
3
如果受控异常引起自动回滚，整个图书订单就会由于电子邮件服务器的关闭全部回滚。
If checked exceptions caused an automatic rollback, the entire book order would be rolled back just because the E-mail server was down.
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