1 sentence

1. 在数学课上，我们学会了如何区分正数和负数。

   zài shù​xué kè shàng, wǒ​men xué​huì le rú​hé qū​fēn zhèng​shù hé fù​shù.

   In math class, we learned how to distinguish between positive and negative numbers.

   Source: Dong Chinese Dictionary