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 true value of a mathematician lies in the problems they leave behind.

I think the key to making a good movie is to make sure that the audience cares about the characters.

人類需要悲傷，正如需要歡樂一樣。

個人的總是政治的，政治的總是個人的。