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。
The accident taught me a lesson I'll never forget.
这次事故给了我一个终生难忘的教训。
The accident taught me a lesson I'll never forget.
那事故给我的教训永远也不会忘记。
I've got a piano lesson later today.
今天晚些时候我有一堂钢琴课。
The class settled down and she began the lesson.
全班安静下来她便开始上课了。