演员们都很有名气，而且这是我第一次在真正的剧院里演出。

The actors were famous, and besides it was my first time in a real theatre.

youdao

在大一学生第一次在课堂上见面时，科学家们针对他们做了一个测试。

The scientists did a test with first-year college students the first time they met in class.

youdao

第一次在寒冷的冬天早起真的很难。

It's really hard to get up early on a cold winter morning for the first time.

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

Now this isn't the first time that we have in Milton the representation of the turning of a person to marble.

这不是第一次,在弥尔顿的表述中把人向石头转换。

耶鲁公开课 - 弥尔顿课程节选

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