lǎo / shī / jiě / shì / le / rú / hé / gēn / jù / bǐ / lì / jì / suàn / xiàn / duàn / de / fēn / diǎn

老师解释了如何根据比例计算线段的分点。

The teacher explained how to calculate the division point of a line segment based on a ratio.