It then USES that power to charge a battery. An hour of walking is enough to tighten the LACES once, and it requires no energy to undo the shoes because that relies on the spring alone.

然后将这些能量给电池充电，走一个小时的路，产生的电量足以系紧一次鞋带，而解鞋带时只需依靠弹簧，因此无需能量。

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It then USES that power to charge a battery. An hour of walking is enough to tighten the LACES once, and it requires no energy to undo the shoes because that relies on the spring alone.

然后将这些能量给电池充电，走一个小时的路，产生的电量足以系紧一次鞋带，而解鞋带时只需依靠弹簧，因此无需能量。

youdao