lesson
单词辨析：
指学习某种技能的课程，常后接介词 in/on；也指学校里的一堂课或课本中的某一课。
lessons in First Aid
急救课
Lessons start at 8 o'clock.
8点钟开始上课。
We have learned Lesson Six. Next week we'll learn Lesson Seven.
我们已经学完了第六课，下一周我们要学第七课。
'Today we'll start a new lesson,' the teacher said.
“今天我们要开始上新课。”老师说。
尤指学校的上课时间；也指某一科目的课程，常后接介词 in。
a class in dancing at the night school
夜校的舞蹈班
What time will the next class begin?
下一节课什么时候开始？
It will take some time before you can go back to your yoga class.
你得再过会儿才能回去上瑜伽课。
指有关某一学科的系列课程，常后接介词 in/on；也指大学中为修读学位或取得某种资格而学习的课程。
a three-year degree course
三年制学位课程
He is doing a one-year journalism course.
他在修读为期一年的新闻学课程。
I'm taking a course in graphic design.
我在上一门平面设计课程。
相关例句：
This lesson is very easy.
这篇课文很浅。
The lesson from all of this is perhaps a broader one
从所有这一切中得出的教训可能具有更广泛的意义。
Wait until the children have settled down before you start your lesson.
等孩子安静下来你再开始上课。
Let this accident be a lesson to all of you!
愿这次事故使大家记取一个教训！
He learned this lesson the hard way — from his own personal experience
吃一堑长一智，他这个教训来之不易——是从他自己的亲身经历中得来的。
We've decided to teach him a lesson.
大家决定治治他。