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

A mathematician's work is mostly a solitary pursuit, but it builds on the work of many others.

電影的力量在于照亮我們存在的陰影。

INDUSTRY. Lose no time; be always employ’d in something useful; cut off all unnecessary actions.

作家必須是一個(gè)永遠(yuǎn)的初學(xué)者，總是懷疑，總是探索。