我们在中学时成为了好朋友。

We became good friends when we were in middle school.

因式分解的概念在中学时引入。

The concept of factorization is introduced in middle school.

她在中学时参加了很多课外活动。

She participated in many extracurricular activities during middle school.

他在中学学习。

He is studying at secondary school.

她在中学里比我矮一级。

Her grade is lower than me in middle school.

我想在中学当橄榄球教练。

I imagine coaching high school football.

我们现在在中学了，好忙碌！

We are now in high school, and a good busy!

我在中学就已经学过生理学。

We had studied physiology in middle school.

我们在中学读书时共一张桌子。

We used to share a desk back in high school.

他认为在中学教英语是值得的。

He thinks teaching English in a middle school is worthwhile.