self._lock = threading.Lock()
As of March 3, get the Bluetti Elite 10 mini portable power station for $112.99 at Amazon, down from its usual price of $199. That's $86.01 off and a discount of 43%. It's also the lowest price we've seen.
，这一点在91视频中也有详细论述
// 易错点5：忘记push当前索引 → 前面的位置无法获取当前身高的参考，结果全错
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