标签可以有多个父标签和子标签，子标签发布的内容在上级标签都可以看到
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otmb Jan 25, 2015
知乎和Quora是否设计类似的?
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memeda OP http://www.zhihu.com/topic/19558203/organize/entire
一个话题有N个父话题，又有N个子话题。 |
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