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。
The night is a great poem, but the stars are its words.
我们一起经历了很多，这让我们更强大。
A mathematician is a maker of patterns, like a painter or a poet.
Nature has been the greatest chemist of all time, and we are just beginning to understand its secrets.