append again has to allocate a new backing store, this time of size
srand(time(NULL)); // 初始化随机种子
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They had been living and working aboard the ISS since August and were expected to stay until February. The crew returned on January 15, which was a decision made by NASA's chief health and medical officer. Once the crew had landed, administrator Jared Isaacman said it was a "serious situation" but didn't go into any detail.
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