With all the lesson preparation I have to do I work 12 hours a day.

加上必须的备课在内，我每天工作12个小时。

《牛津词典》

We have decided to teach him a lesson.

大家决定治治他。

youdao

We'll also have a special lesson from a guest cartoonist, who will teach us how to draw cartoons.

我们还将有一个特别的课程，由客座漫画家主讲，教我们如何画漫画。

youdao

"It is a lesson to many countries to open up and have far more cultural exchange and make that a priority for diplomacy.

VOA: special.2010.06.21

On Tuesday,Geithner told Congress that the government must have the authority to seize non-bank entities, arguing that massive destabilizing dangers can come from financial institutions - a lesson learned from the rescue of American International Group,or AIG, a giant insurer that received a $180 billion taxpayer bailout.

VOA: standard.2009.03.25

While doing his best today to draw a line between Jews and Zionists, he seems to have missed a history lesson from a true and honorable freedom fighter whose birthday Americans celebrated on Monday.

FORBES: There He Goes Again: Egypt's Morsi Stuns U.S. Senators In Meeting With 'Jews-Control-Media' Slur

Firstly, people who have lent to the government before have learned a lesson: that it is indeed very tempting for a government to inflate their way out of such debts.

FORBES: Inflation Won't Cut the Budget Deficit

Some experts are therefore saying that the German people may have to learn a hard lesson.

FORBES: A Nuke-Free Germany May Be Forced Into Dirty Embrace With Coal