在低银离子浓度时，光催化能完全还原银离子。
When the concentration of silver ions is very low, silver ion can be reduced almost completely.
不过，复原完成之后，电脑可能无法完全还原至其初始状态。
However, the computer might not be fully reverted to its initial state after the rollback completes.
任何记忆都是无法被完全还原的，它们不得不面临被“今天”所“篡改”的宿命，并服务于记忆主体在此时此地的精神需要。
No memories could be restored, as they have to face the fate of being "falsified" today, and serve the current spiritual demand of the subject of memory.
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