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

A true mathematician is always a student, always learning.

"A writer's duty is to question, to challenge, and to illuminate the complexities of life."

The best way to predict the future is to invent it.

That is what learning is. You suddenly understand something you've understood all your life, but in a new way.

學(xué)習(xí)某事的最好方法就是去教它。

宣判死刑之人應(yīng)當(dāng)親自揮劍。