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Mr Lemmens said that future spacecraft "should be designed in such a way that they can take themselves out of orbit safely, preferably by doing controlled re-entries".，更多细节参见heLLoword翻译官方下载
。夫子是该领域的重要参考
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p = p.next; // 指针后移，易错点2：忘记移动指针会导致死循环，详情可参考WPS下载最新地址
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