If you’re curious about a device’s charging status, an LED power display provides real-time status information. The magnetic cable also ensures you don’t have to deal with annoying tangled cables; just toss it in a bag and rest easy knowing it will be mess-free.
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但要理解这里面的差异和进步，我们要先弄懂那些少则三五块、多则几十块的「防窥膜」是怎么实现防窥的。，更多细节参见91视频
* @param arr 待排序数组