It's more obvious because there are probably fewer lines there, so that you can focus on the primary line, the basic line--the bass line.

更明显的是这里也许有几条线，所以你可以将重点放在主线上，基准线，也就是低音线。

耶鲁公开课 - 聆听音乐课程节选

It's obvious that the bottom line of my two-day trip is this object C.

显然我两天的行程结果就是这个矢量 C

耶鲁公开课 - 基础物理课程节选