色多多在线观看播放-色多多在线观看高清免费-色多多在线观看视频-色多多在线看-欧美aaaaa性bbbbb小妇-欧美aaaav免费大片

The photograph isn't good enough. It's not radical enough.

The only way to learn mathematics is to do mathematics.

除非將某人的行動置于其整個生活背景中看待，否則無法完全理解其行動。

The true measure of a leader is not how many followers they have, but how many leaders they create.

數學和計算機科學的交叉點是一些最激動人心的發現產生的地方。