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 great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all.

人工智能的關鍵在于知識的表征。

The world is not a mere sum of sensations, but an organized whole.

生活是一本書，每一天都是新的一頁。