There are actually tried and true formulas based on something called color harmony that can help.

实际上，有一些基于色彩和谐的可靠公式可以帮助你。

But when she calculates these slopes using the tried and true formula " rise over run, " a most curious thing happens.

但是，当她使用久经考验的真实公式“上升超过运行”来计算这些斜率时，一件最奇怪的事情发生了。