我们在第一周遇到了一些困难。

We encountered a number of difficulties in the first week.

《牛津词典》

我在第一周大家认为是乐观和快乐。

I think in the first weeks everybody was optimistic and happy.

youdao

在第一周他也许会尽力准时工作。

During the first week he would try to be punctual for work.

youdao

When I said in Week One that you don't actually have zeros and ones inside this header file; right?

在第一周我说过的，我们在这个头文件中,是没有二进制的，是吗？

哈佛公开课 - 计算机科学课程节选

In the first example, maybe your mother has been spending a week with you.

在第一句例句中，可能你的母亲陪着你花了一周的时间，

Why don't 课堂 - SpeakingMax英语口语达人

And actually before we start into today's topics, I want to remind everyone and hopefully you all do remember that our first exam is coming up and it's coming up in exactly a week, so it'll be a week from today, next Wednesday.

实际上在这之前，我还要提醒大家一下,希望大家都记得,我们的第一次考试就要到了,就在下周，距离今天正好一周，下周三。

麻省理工公开课 - 化学原理课程节选