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 Langlands program is an invitation to explore the unknown territories of mathematics.

"The act of writing is an act of courage."

"We do not write to be understood; we write in order to understand."

過去是跟隨你進入未來的影子。

There is danger from all men. The only maxim of a free government ought to be to trust no man living with power to endanger the public liberty.

購買工具。從購買你能找到的最便宜的工具開始。升級你經常使用的工具。如果你在某項工作中最終選擇使用了某種工具，就買你能負擔得起的最好的。