相关系数的可能误差不是一个固定的量，而是取决于样本的大小。

A man is like a fraction whose numerator is what he is and whose denominator is what he thinks of himself. The larger the denominator, the smaller the fraction.

 释义：随随便便交一些不好的朋友，还不如整天读书更好。

创造就是活两次。

"To act is to explore the depths of human emotion and to bring it to the surface."

The man who removes a mountain begins by carrying away small stones.

企业上云不是选择题，而是必答题。