滚条，汉语词汇，拼音gǔn tiáo，指包在衣服边沿（如止口、领外沿与下摆等）或部件边沿处的条状装饰部件。同“滚边”。
... 〔风琴袋 accordion pocket〕通常指袋边沿装有似手风琴风箱伸缩形状的袋, welted edge 滚条Welt 嵌条 Panel ...
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事务时间包括从应用程序的声明活动开始，直到一条提交或回滚命令隐式或显式地结束事务为止。
The transaction time includes the time at which an application's statement activity begins until a commit or rollback implicitly or explicitly ends the transaction.
如果发生了错误，catch块可以回滚事务开始以来发生的所有更改，并打印出一条错误消息。
If something goes wrong, the catch block rolls back all changes made since the transaction was started, and then prints out an error message.
这意味着，如果由于尚未接收到某条消息而已经设置了failed标志，则可以回滚事务，并将组中的所有其他消息返回给队列。
This means that, if the failed flag has been set because a message has not been received, we can roll back the transaction and return all of the other messages in the group back to the queue.
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