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.
为使钨完全还原为5价，通常单独使用三氯化钛或氯化亚锡作还原剂。
In order to reduce tungsten to W5 + completely, titanium trichloride or stannous chloride were generally used as reducing agents.
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