Lǎoshī / xiān / jiǎngjiě / jīfēn / fāngchéng / de / jīběn / gàiniàn / zài / dài / wǒmen / zuò / liànxí

老师先讲解积分方程的基本概念，再带我们做练习。

The teacher first explained the basic concepts of integral equations and then guided us through exercises.