The study was performed among 253 schoolchildren in Spain.

这项研究在西班牙的253名学童中进行。

youdao

I started exercising regularly two years ago and went from 253 pounds to a healthy 160 pounds and that is the only thing I did not give up halfway.

两年前，我开始定期锻炼，体重从253磅降至健康的160磅，这是我唯一没有半途而废的事情。

youdao

DeWP has currently 253 admins.

deWP目前有253名管理员。

youdao

One effect of the attempt to blow up flight 253 is increased security at international airports in Europe.

VOA: standard.2009.12.27

Passengers on Northwest Airlines Flight 253 from Amsterdam to Detroit say just as the plane was getting ready to land there was a loud pop, and then panic.

VOA: standard.2009.12.26

Also,the effectiveness of such watch lists is being called into question, as the man charged with trying to bring down flight 253 on Christmas Day was not on the U.S.'no fly' list.

VOA: standard.2009.12.28