DROPSCHEMA 过程在事务控制下执行，它自己不执行提交或回退。
The DROPSCHEMA procedure is under transaction control and does not perform commit or rollback on its own.
循环和事件处理程序通常意味着控制流回退，这表明状态机是一种更合适的实现方法。
Loops and event handlers usually imply that the control flow is going back, which suggests that state machine is a more suitable implementation.
最重要的区别在于，你要做的只是修改一下控制台参数去运行不同的版本，而不是回退代码重新编译。
The difference between changing a console variable to get a different behavior versus running an old exe, let alone reverting code changes and rebuilding, is significant.
版本控制有助于比较schema的不同版本，开发者可以对已进行的变更进行回退和重做处理。
Versioning helps comparing different versions of the schema and the developer can roll back and forth the changes performed.
TCP拥塞控制就是在这种情况下，通过服务器和客户端的控制“回退”，以确保网络对于其他的所有用户仍然可用。
TCP Congestion Control on clients and servers is setup to "back off" in these cases in order to ensure that the network remains available for all its users.
不可见字符。如控制符、回退删除符、换行符等。
A character with no visible representation, such as a control character, a backspace, newline, and so on.
利用西门子802DSL系统的中断控制来实现机床轴回退的功能，保证机床安全可靠运行。
Use the interrupt control of Siemens 802D SL system to achieve the emergency retraction function for machine tool axis to ensure safe and reliable operation of machine tools.
利用西门子802DSL系统的中断控制来实现机床轴回退的功能，保证机床安全可靠运行。
Use the interrupt control of Siemens 802D SL system to achieve the emergency retraction function for machine tool axis to ensure safe and reliable operation of machine tools.
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