曹雅学：致奥巴马：中国为何没有曼德拉

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VOA Chinese, Sept 22, 2015
http://www.voachinese.com/conten ... 150922/2974075.html
("曹雅学女士是英文网站chinachange.org的创办人兼总编。这是曹雅学撰写的文章。这篇文章不代表美国之音的观点: 黄文勋, 唐荆陵 and 郭飞雄: "我坐在离白宫4.2英里的家里写这封信" -- the very one you are reading now in VOA Chinese)