The kids were playing by the river and one of them fell in.

孩子们在河边玩耍时，其中一个突然落水了。

《牛津词典》

One day, a little monkey is playing by the well.

一天，有只小猴子在井边玩儿。

youdao

They're simply playing by the rules as outlined by what they can and cannot do on the site.

他们只是按照网站的规则在做。

youdao

Anti-doping officials say they want to protect the integrity of sports by guaranteeing what they call a level playing field.

VOA: special.2011.04.12

If you assume that, you are not playing by the rule, we don't know what force it exerts.

如果你假定了,那你就犯规了,我们不知道它施加了多大的力

耶鲁公开课 - 基础物理课程节选

The civility entails the virtues of peace, equity, fairness, playing by the rules.

文明意味着和平，公正，公平，遵纪守法的美德。

耶鲁公开课 - 政治哲学导论课程节选

Wall Street apparently likes the notion that HCA is now playing by the feds' rules.

FORBES: Companies, People, Ideas

In the past they were doing so well they didn't think about playing by the rules.

CNN: THE NEW YORK GOLD RUSH

He is, however, as even some of his critics accept, playing by the rules.

ECONOMIST: America��s roots