Integrity is maintained even across databases by making sure that all the recoverable actions either go forward or go back.
通过确认所有的可恢复的动作或者向前或者后退来在数据库之间维持数据的完整性。
Although we all like moving forward, it is often useful to go back to reproduce a build or revert to a good known state.
尽管我们都喜欢往前走，但是返回来重新构建生成一个构建，或者变回成一个两良好的状态通常是十分有用的。
Using buttons, you can move forward or backward in time, to go back to any date and time in the past and return to the current time.
通过按钮能够在时间上前移或后移，能够回到过去的任意时间点，并且能够回到当前的时间点。
You have full control of the playback and can easily pause, go back or skip forward to match your own pace.
你有完全控制回放，可以轻松地暂停，回去或快进，以配合自己的步伐。
There are moments in a match when the ball hits the top of the net, and for a split second it can either go forward or fall back.
网球比赛中，有一种情况叫“擦网球”，那一瞬间，球可能弹过网也可能被弹回。
This puzzle is particularly ingenious because many very clever wizards have no sense of logic at all, which would mean that they would be stuck in that chamber, unable to go forward or back.
这个迷题设计得非常精妙，因为许多伟大的巫师都不精于逻辑，只能永远被关在这里，再不能前进也不能回头了。
This puzzle is particularly ingenious because many very clever wizards have no sense of logic at all, which would mean that they would be stuck in that chamber, unable to go forward or back.
这个迷题设计得非常精妙，因为许多伟大的巫师都不精于逻辑，只能永远被关在这里，再不能前进也不能回头了。
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