今天崎岖的峡谷内还不知名的路线，将来完全有可能成为地图中一条红色虚线。

Today's unknown route through a rugged canyon might well become a dotted red line on some future map.

youdao

这张地图上国界以虚线标出。

Country boundaries are shown on this map as dotted lines.

《牛津词典》

为什么有些地图有虚线边界？

Why do some maps have dotted borders?

youdao

You can see that the dash distribution I drew has more out in the tails, so we call it fat-tailed.

你们可以看到,虚线画的这个分布,尾部要长很多,所以我们叫它长尾分布

耶鲁公开课 - 金融市场课程节选

So when you go ahead and draw these on your problem-sets or on your exams, it's a good idea to put these dashed lines in, both for you and for people reading it to see exactly where your molecular orbitals are coming from.

所以当你在做课后题,或者考试的时候要画这些图时，最好把这些虚线放进去，既方便你自己也方便别人知道,这些分子轨道是从哪里来的。

麻省理工公开课 - 化学原理课程节选

I'll pick up wherever the dotted line emerges in the subsequent lecture.

下节课我会把划虚线的部分接着讲完。

耶鲁公开课 - 文学理论导论课程节选