That day, my brother and I learnt a good lesson.

那天，我哥哥和我学到了一个很好的教训。

youdao

Though the cost has been high, as long as all the market players learn their lessons, it will be a lesson well learnt.

尽管代价很大，只要所有的市场参与者汲取经验，这将是一门值得学习的课程。

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"The lesson learnt is that you don't isolate researchers," says Eric Schmidt, the boss of Google, who started his career as a computer scientist at Bell Labs and later at Xerox PARC.

“不能让研究人员孤军作战，这是一条教训，”谷歌首席执行官埃里克·施密特说。施密特在事业初期曾是贝尔实验室的一名计算机科学家，之后在施乐帕洛·阿尔托研究中心工作。

youdao

Again the national security strategy proposes a new departure, again a lesson learnt from recent conflicts ranging from Rwanda and Bosnia to Iraq, Afghanistan and Somalia: to create a standby international civilian capability so that for fragile and failing states we can act quickly and comprehensively by combining the humanitarian, peacekeeping, stabilisation and reconstruction support they need.

BBC: In full: Brown security statement

"This is a very tragic case with a lesson to be learnt, " said Mr Howes.

BBC: Pills and bottle

They, too, learnt a lesson from the 1991 war.

ECONOMIST: Turkey and Iraq