如果发现干扰，就会回退并重试。
清单5显示了向下迁移然后回退的结果。
Listing 5 shows the results of migrating down and then back up.
这是因为回退机制只能用于指令元素而不能用于声明。
That is because the fallback mechanism only works for instruction elements, not declarations.
通过使用导航条可暂停、退出、回退或快进演示的内容。
Use the navigation bar to to pause, exit, rewind, or fast forward portions of the demo.
回退到声明类型——如果xsi：type未知则使用声明类型。
Fallback To declared type - use declared type if xsi: type is unknown.
阿里巴巴这么做了，看到了一个男人，吓得往回退，叫了出来。
Ali Baba did so, and seeing a man, started back in alarm, and cried out.
拒绝人们回退到旧方法的请求，从而展示你对这项改造的决心。
Demonstrate your commitment to the transition by declining people's request to fall back on old habits.
同样，如果发生错误，那么过程的调用者需要决定是否将过程回退。
Similarly, if an error occurs, the invoker of the procedure needs to decide whether to roll back the process to that point or not.
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.
如果两者都有，我们就可以快速回退，只要指向JCL中旧的加载模块即可。
If we have both, for quick fallback, we could just point to the old load module in our JCL.
这里的问题是，没有一个标准HTML回退操作来导航到一个可用页面。
The problem here is that there is no standard HTML fallback to navigate to one of the available pages.
Fragments：演示fragment布局，回退栈，状态存储等
Fragments: Various samples that demonstrate fragment layouts, back stack, restoring state, and more.
例如，在回退情况下，最好能同时有程序包的当前版本和之前可用的版本。
For example, in a fallback situation, it would be nice to have both the current VERSION and the prior VERSION of a PACKAGE available.
对于第一个示例，由于时间的原因，我实际上不得不回退了服务器迁移操作。
I actually did have to roll back the server migration from my first example because of time.
如果造成模式变化的代码版本仍然处在不完善的状态，那么经常必须手工回退变化。
And if the code version causing the schema change is in any way deficient, the change must often be rolled back by hand.
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.
当在触发器的处理过程中抛出异常时，触发器终止，导致触发器触发的整个语句回退。
When an exception is thrown during processing of a trigger, the trigger aborts, and the entire statement that caused the trigger to fire is rolled back.
如果对应的空间行不存在，那么就不删除任何东西；这种情况不是异常，不会导致事务回退。
If the corresponding spatial row does not exist, there is simply nothing to delete; this condition is not an exception that causes a transaction to roll back.
编码实践应该侧重于功能测试，而非浏览器，并为较旧版本的浏览器提供正确的回退之策。
Coding practices should focus on testing for capabilities, not browsers, and providing the right fall backs for older browsers.
故障恢复/回退：这是在故障转移发生后将资源组移回其最初在其上运行的原始节点的操作。
Failback/fallback: This is the action of moving back resource groups to the nodes on which they were originally running after a failover has occurred.
如果在过程中过晚回退，会影响正常运行时间，或者让问题复杂化，到了不可能回退的程度。
If the changes get rolled back too late in the process, you could affect uptime or complicate the problem to the point where no back-out is possible.
当然，最坏的情形是回退到使用线程来进行阻塞操作，因为这些操作确实无法转换成异步回调。
Of course, the worst case is to fall back to using threads for blocking actions that really cannot be converted into asynchronous callbacks.
BOQTHRESH属性包含在将消息存放到回退队列之前可以回退(backout)的次数。
The BOQTHRESH attribute contains the number of times a message can be backed out before being placed into the backout queue.
如果memcached服务宕掉，应用程序应该回退到从原始数据源加载信息并对信息进行显示所需的格式化。
If the memcached service goes down, your application should fall back to loading the information from the original data source and formatting it as necessary for display.
这意味着你可以任意回退或前进，很灵巧的解决了浏览器回退按钮的问题——如果在Web应用环境下使用的话。
This means that you can actually step back (and forward) in time, which is a very neat way of solving the browser back button problem - if used in the context of web applications.
请注意，相对XSLT 1.0规范，关于什么情况下应用回退机制的说明在 XSLT 2.0 规范中更细化了。
Note that the text about when the fallback mechanism is applied in the XSLT 2.0 spec is refined compared to the XSLT 1.0 spec.
微软推荐beta测试者回退到Vista然后升级到Windows 7的最终发布版本，但是仍然有许多人会抵制。
Microsoft has recommended that beta testers go back to Vista and upgrade from it to the final release, but that's something many will resist.
由于xsl:with-param不是 xsl:apply-imports顺序构造器的一部分，不适用回退机制。
Since the xsl:with-param is not part of a sequence constructor of xsl:apply-imports, the fallback mechanism is not applicable.
此选项可以指定CICS事务异常终止是否应触发恢复的RRS单元的自动回滚，并强制执行在CICS工作单元中所进行的所有更新的回退。
This option specifies whether or not a CICS transaction abend should trigger an automatic rollback of the RRS unit of Recovery and force a back-out of all updates made within the CICS unit of work.
现在人们过一会就能回答问题，要是回退几十年，人们根本就不会去费心问这些问题，因为要得到回答非常困难，几乎是不可能的事情。
People now answer questions in a few moments that a couple of decades back they would not have bothered to ask, since getting the answer would have been impossibly difficult .
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