I am 20 years old the first time I donate blood.

我第一次献血时20岁。

youdao

I was 14 years old the first time I went running and I was with my dad, the day before my very first track practice was going to start.

十四岁时，第一次和爸爸一起去跑步。那天恰好是我首次进行田径训练的前一天。

youdao

The old brown bear made a speech first.

年老的棕熊首先发表了一篇演讲。

youdao

Susan Larson reads a scene from Nancy Drew's first adventure, "The Secret of the Old Clock": "Nancy struggled to get away.

VOA: special.2009.08.24

The old First Boston Company had some honorable employees and one of the employees was a good friend of mine. He went there in the early 1950s.

旧时的第一波士顿公司的职员,也是尽职尽责，我有位好朋友,在五十年代在那里工作。

斯坦福公开课 - 经济学课程节选

Dentists say children should have their first dental visit at least by the time they are one year old.

VOA: special.2009.03.11

He was three years old the first time Orville Wright took the first ever flight in an airplane and barely a teenager when World War I broke out.

CNN: World's second-oldest man known dies at 113

The second period was always going to struggle to live up to the intensity of the first and the half was a fully 15 minutes old before the first chance came for either side.

BBC: Nottm Forest 4-1 Gillingham

The 22-year-old took the first four wickets to fall before Blackwell pinned Samit Patel lbw 122-5.

BBC: Munday spins Notts into trouble