The probable error of a correlation coefficient is not a fixed quantity, but depends upon the size of the sample.
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。
Innovation is not about inventing something entirely new, but about improving what already exists.
The boundary between physics and mathematics is not as clear-cut as one might think.
Quality is not a fate; it is a choice.