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

每個數學問題都有一個解決方案；只是需要時間和努力去找到它。

決定不做什么和決定做什么同樣重要。

"Experience is simply the name we give our mistakes."

The metropolis exacts from man as a discriminating creature a different amount of consciousness than does rural life.

"A good book is an event in my life."

唯一真正的發現之旅不在于尋找新的風景，而在于擁有新的眼光。