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

創(chuàng)新不僅僅是技術(shù)的問題，而是解決實(shí)際問題。

Anything truly novel is invented only during one’s youth， later one becomes more experienced more famous， and more blockheaded.

時(shí)間是我所有作品中看不見的材料。

The mind is a system of interrelated processes.

社會(huì)的進(jìn)步取決于每個(gè)人的努力。