It always takes the class a while to settle down at the start of the lesson.

那个班一上课总得过一会儿才能安静下来。

《牛津词典》

He learned a lesson at the cost of blood.

他以血的代价吸取了教训。

youdao

If you write on the blackboard, rub it off at the end of the lesson.

如果你在黑板上写字，下课时要擦掉。

《牛津词典》

Louis Hobeika, an economist at Lebanon's Notre Dame University, says one lesson of the crisis should be Dubai's reassessment of its financial limits.

VOA: standard.2009.11.30

The basic lesson of this movie is, and you probably knew this already, everyone at Yale is a spy and by the way also a psycho.

这部电影的观后感就是,耶鲁人都是间谍,而且都是神经病

耶鲁公开课 - 博弈论课程节选

Let's do the second lesson I emphasized at the beginning.

想想我在刚上课时说的教训

耶鲁公开课 - 博弈论课程节选

Lily Webster, a Year 11 pupil at Stowmarket High School, was taking part in the PE lesson at Mid Suffolk Leisure Centre on Monday when she collapsed.

BBC: Trampoline death girl Lily Webster: Family pays tribute

The lesson at the heart of Sir Mervyn's lecture is a useful one for UK policymakers.

BBC: Sir Mervyn, the UK and the euro

It starts early, and there's always a free dance lesson at the beginning.

NPR: Bhangra's DJ Rekha Takes the Dance Floor