p = p.next; // 指针后移，易错点2：忘记移动指针会导致死循环
Виктория Кондратьева (Редактор отдела «Мир»)
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The mission has already faced years of delays, and Nasa is under pressure to get the astronauts on their way as soon as possible. However, the US space agency said it would not compromise on safety.