Because it has to drop off precipitously.

因为它必须陡然减少。

麻省理工公开课 - 固态化学导论课程节选

This pink line has to drop off from a all the way to c.

这条粉色的线要经过纵坐标a-c

耶鲁公开课 - 博弈论课程节选

How far along do I have to go drop off a - c when I have slope -2b?

斜率-2b的线还要经过哪个横坐标呢

耶鲁公开课 - 博弈论课程节选