精品无码久久久久久国产_成人午夜在线视频一区_亚洲最大的av网站_亚洲欧美综合区自拍另类_91精品国产一区_日韩精品中文在线观看_一道本无吗dⅴd在线播放一区_国产精品旅馆在线_欧美午夜久久久_亚洲自拍在线观看_黑人精品xxx一区一二区_亚洲精品日韩久久久_在线视频一区二区_国产欧美久久一区二区_中文字幕精品在线视频_成人欧美在线观看

Man is born free， and everywhere he is in chains.

The dream is free but the hustle is sold separately.

A good algorithm is like a sharp knife—it does exactly what it is supposed to do with a minimum of effort.

科學(xué)家必須有勇氣捍衛(wèi)自己的思想，即使它們不受歡迎。