mba 2020 升级后电量掉的很快，该怎么解决。时间机器没有备份过，也没用过。
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alcoholpad OP 电量掉的实在太快了，想回到原来的系统
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alcoholpad OP 哎。算了算了，看了系统降级的教程，真是懒得折腾了
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