他在一次练习课上扭伤了背部。

He strained his back during a practice session.

《柯林斯英汉双解大词典》

刘翔在一次练习事故中伤了一只脚。

Liu Xiang injured one of his feet in a training accident.

youdao

在一次练习中，受训人员围成一个圈，每个人说出一段留下深刻印象的操场游戏经历。

During one exercise the trainees gathered in a circle and each was asked to recall a playground experience that had left a lasting impression.

youdao

These are the basic theoretical structures that you incidentally need for the problem set, ... the first problem set. The first problem set-- I guess you've--you can turn in your first problem set here before you leave because it was due today.

这些是基础的理论框架,你会在做习题的时候用到它们，第一道练习。。。第一次练习是-,第一次练习作业的截止日期是今天,所以你们在今天在离开前把作业交上来。

耶鲁公开课 - 金融市场课程节选