1989-6-4

https://www.youtube.com/watch?v=giB4-aZe5xo

https://zh.wikipedia.org/wiki/%E5%BE%90%E5%8B%A4%E5%85%88

http://cn.nytimes.com/china/20140603/c03tiananmen/zh-hant/

http://www.tiananmenmother.org/forum/forum110219001.htm