extract2, when we know the final size of the slice, we do one heap
除了返乡路上会遇到充电功率下降的问题，对于开电车回乡的小镇青年来说，乡镇的补能不足或许是另一大问题。
，这一点在搜狗输入法下载中也有详细论述
Truth be told, you could argue that many of these shortcomings are typical of a retro Polaroid-inspired instant camera and, thus, part of the experience. If that’s what you’re looking for, the Flip is the perfect camera for you.
def save(self, item: Item) - None:
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