体育馆在第一天比赛结束的时候清场了。

The stadium emptied at the end of the first day of games.

《柯林斯英汉双解大词典》

我们努力确保孩子们在上学的第一天不胆怯。

We try to make sure children don't feel intimidated on their first day at school.

《牛津词典》

第一天很奇怪。

That first day was weird.

《柯林斯英汉双解大词典》

On their first day of class in the fall of 2007, we have 41 students in our class this year.

007年秋天，开课第一天，今年一共收录41名学生。

哈佛公开课 - 幸福课课程节选

So you can figure out where things are, so that when you start the first day,

这样你就能知道学校有哪些建筑，当第一天上课的时候，

写推荐书的人 - SpeakingMax英语口语达人

There's a parallel between day one, day four; day two and five; day three and six.

第一天和第四天是对应的;,第二天和第五天，第三天和第六天。

耶鲁公开课 - 旧约导论课程节选