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 study of mathematics is the indispensable basis for all intellectual and spiritual progress.

當(dāng)我們意識(shí)到維持現(xiàn)狀的痛苦大于改變現(xiàn)狀的痛苦時(shí)，我們就會(huì)改變自己的行為。

We are all in the gutter, but some of us are looking at the stars.

保持饑餓，保持愚蠢。