我是第一次写书。

I'm a green hand in writing.

youdao

如果我是第一次去某个地方，那么我一定会上网谷歌搜索一下。

If I'm going somewhere for the first time, then I'll definitely go online and kind of google it.

youdao

我是第一次，但她像个专家。

It was my first time, but she was like a pro.

youdao

So now, the enzyme is locked up with being built, and the penicillin has effectively killed the bacteria.

所以这是我第一次感受到,我想在单个原子的层面上思考这些分子,所以这时我的专业转到了化学方向。

麻省理工公开课 - 化学原理课程节选

I remember my first exposure way back in the 60s was a photo of the Biafra famine you remember in the civil war in Nigeria.

我记得我第一次感受到贫困，是在60年代,那是一张关于尼日利亚饥荒的照片,你应该记得，是尼日利亚内战期间。

普林斯顿公开课 - 人性课程节选

OK, there's the first run, I'm going to take a different list.

好的，这是第一次运行，我要测下另外一个列表。

麻省理工公开课 - 计算机科学及编程导论课程节选