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

良好的教養在于隱藏我們對自己較佳的評價，以及隱藏我們對他人較差的評價。

To do mathematics is to engage in a dialogue with the universe, seeking answers to questions we may not even know how to ask yet.

It's not about money. It's about the people you have, how you're led, and how much you get it.

Cryptography is the art of transforming information into a form that is unintelligible to anyone who does not possess the key to unlock it.