...subparagraphs are met » 已还原的版权如果恢复的日期当日或之后是符合规定的下列各项之一 at older operations » 在较早的操作 the principle of voluntary exchange » 自愿交换原则 ..
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可恢复流程记录其操作，这样在发生故障时可以恢复到较早的状态。
Recoverable processes log their actions and thus can restore earlier states if a failure occurs.
由于从来不覆盖数据，这可以更简单地确保存储永远不会处于不一致的状态(因为在新的写入操作完成以后较早的数据仍保留)。
By never overwriting data, it's simpler to ensure that the storage is never left in an inconsistent state (as the older data remains after the new Write operation is complete).
在较早版本的 Perl 和 UNIX 以及其它操作系统上也可以使用本文中的示例，但应当将可能的功能故障作为练习来解决。
The examples may work with earlier versions of Perl and UNIX and with and other operating systems, but you should consider their potential failure to function as an exercise to solve.
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