zài / shù / xué / kè / shàng / , / lǎo / shī / jiāo / wǒ / men / qū / fēn / dān / shù / hé / ǒu / shù / .

在数学课上，老师教我们区分单数和偶数。

In math class, the teacher taught us to distinguish between odd and even numbers.