zài / shù / xué / kè / shàng / lǎo / shī / ràng / wǒ / men / yòng / shùn / xù / shù / biǎo / shì / bǐ / sài / míng / cì

在数学课上，老师让我们用顺序数表示比赛名次。

In math class, the teacher asked us to use ordinal numbers to indicate the rankings in the competition.