Sometimes they swam around their tanks casually, whereas at other times they were directed and rewarded by their trainers to swim at their fastest.

有时候它们会偶然地在池底游动，然而在其他时间里它们被训练者指导，并且在它们快速游动时会得到奖赏。

youdao

I never swam but I passed my gym work anyway, by having another student give my gymnasium number (978) and swim across the pool in my place.

我从未游过泳，却又终究通过了体育课，那时让另一位学生用我的体育课号码(978)，代替我又过了游泳池。

youdao

The river, which she swam last year in a 4-mile affair, is a pretty setting _ and those vistas will help keep her entertained during the three-hour swim.

这条河，她游去年4英里的事，是一个相当设置_和前景将有助于使她在娱乐三个小时的游泳。

youdao