lessonn.教训；课，功课，课业；榜样，典范vt.教训，告诫，训斥；给 ... 上课lessons about life生命教育lesson of the past过去的教训lesson examination课程考试Lesson explanation说课Lesson preparation备课lesson of accident事故教训Lesson's Seedeater费用分类lesson in chemistry化学课lessons of database数据库课程lesson presentation说课

1. Let this accident be an object lesson in the dangers of drinking and driving.
   这一事故可以作为醉酒驾驶危害的实际教训。
2. The first lesson in driving is how to start the car.
   学驾驶汽车的第一课是启动。
3. I was busy looking up all the new words of the lesson in my dictionary.
   我忙着在字典里查本课所有的生字。
4. Professor Li is absent, I will take the lesson in the place of him.
   李教授不在，我替他上课。