何毓琦的个人博客分享 http://blog.sciencenet.cn/u/何毓琦哈佛(1961-2001) 清华(2001-date)

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Third group photo during visit to a typical Bulgarian family (can you locate the one classmate not in the previous two group photos?)

上传于 2014-11-26 23:53 (515 KB)

GMT+8, 2024-4-25 23:07