Rebuild is designed to work on an empty file system and restore it back to the saved state.
设计重建的目的是为了能在空文件系统上操作，并将它还原为已保存的状态。
These migrations are all saved and time-stamped, to make it possible to roll back to previous versions of the data structure.
这些迁移操作都会保存，并加上时间戳，让我们可以回滚到数据库结构的上一个版本。
They remembered everything they heard, came back and repeated it to her at their own speed, which saved time. LLF, if he tried hard, could understand scraps of it.
它们记下所有听到的，然后返回来以它们的速度重复给奥瑞丝，这样节省不少时间。
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