人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
int mid = left + (right - left) / 2; // 防止溢出的中点计算
After six agonising minutes, Jack Swigert's voice cut through the silence.
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When it comes to this specific business, what is something you’ve found particularly challenging and/or surprising that people who get into this type of work should be prepared for, but likely aren’t?