The PAC learning framework provides a formal way to quantify the learnability of a concept class.

我不是那种会让对我决心的爱减少的人。

I was born in Africa.I came to California because it’s really where new technologies can be brought to fruition， and I don’t see a viable competitor.

股市中的典型大赢家需要三到十年或更长时间才能实现。

宇宙不仅比我们想象的更奇怪，它比我们能够想象的还要奇怪。

幸福晚年的秘诀在于要有好的记性和坏的记性。