记住，暗一点，往往比亮一点更有质感。
int key = arr[i];。关于这个话题，91视频提供了深入分析
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New analysis of Apollo Moon samples finally settles debate: « For decades, scientists have argued whether the Moon had a strong or weak magnetic field during its early history (3.5 - 4 billion years ago). Now a new analysis shows that both sides of the debate are effectively correct. »，更多细节参见51吃瓜