In one year she turned from a problem child into a model student.

一年内，她从问题儿童变成了模范学生。

《牛津词典》

Thanks to my English teacher, I turned from a problem child into a model student in just one year.

多亏了我的英语老师，我在一年内从问题儿童变成了模范学生。

youdao

After one year, he arrived in China alone and became a student of Beijing Opera at a Beijing school.

一年后，他独自来到中国，在北京的一所学校学习京剧。

youdao

Joe is a twenty-one year old student at the University of Virginia.

VOA: special.2009.12.28

Antonio Stefanus, a 21-year-old biology student at the University of Namibia, is one of them.

VOA: standard.2009.11.27

No, he is not a toddler or an adolescent-but a 25 year old law student, one year away from financial and physical independence.

FORBES: Dreams and Values

The single most crucial year is the one that begins on Jan. 1 of a student's junior year in high school.

WSJ: The College-Aid Shuffle

Kehaulani Kealoha-Scullion teaches social studies now and was a student at Punahou one year behind Obama.

CNN: Retracing the footsteps of young Obama