going downwind faster than the wind ！！！
https://y/yCsgoLc_fzI
(发现短链接点不开了，换一个
https://www.Y.com/watch?v=CkhBskovitQ ,Y是不可描述视频网站)
Enjoy!
然后下面是Mark Levi的分析
https://4ccb06ba-5733-4d01-9652-1f173bc0e51c.filesusr.com/ugd/4d55eb_c8a65bc160454d618b67ba64b4005269.pdf
让你们来听课不听，后悔了吧
--
修改:vinbo FROM 211.161.243.*
FROM 112.120.42.*