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iPhone 在使用一天后经常会电量耗尽的时候，此时我们可以开启“低电量模式”来延长 iPhone 的使用时间。如何能让 iPhone 在需要时自动开启“低电量模式”呢？一般情况下当 iPhone 电量降低至 20% 时，会提醒用户可...