这是你第一天当妈妈。

It's your first day of being mother.

youdao

你第一天要干什么？

What will you do on your first day?

youdao

这跟今天是你第一天或者你已经坚持了20年没有关系。

It doesn't matter if today is your first day or if you've been running for twenty years.

youdao

As I told you, on the first day, I do look at trends.

我告诉你，第一天开始我看重的是趋势。

麻省理工公开课 - 固态化学导论课程节选

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

If you walk into a class with 5th graders, who on day one are years behind where they should be and hate school and are kind of like to hate you because of it.

如果你走进一个五年级教室，学生们从第一天开始就落后很多,恨学校，因此也恨你。

哈佛公开课 - 幸福课课程节选