一棵树上的任何结点(不包括根本身)称为根的_____。若B是A的子孙,则称A是B的_____。
子孙;祖先
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上一篇:(In this sense, South Korea is treading a path not taken by Japan. While Japanese interests span the globe, few foreign firms have successfully penetrated Japan’s home turf. Korea, too, has a legacy of xenophobia; and the Koreans are clearly wary of
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