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☆lesson 课

A lesson is a fixed period of time when people are taught about a particular subject or taught how to do something.

lesson是指在一段固定的时间内，人们学习某一特定的科目或如何做某事。

例：

It would be his last French lesson for months.

这将是他以后几个月里的最后一次法语课。

☆class 课；课程；课堂

A class is a course of teaching in a particular subject.

class（课堂）是某一特定学科的教学过程。

例：

He acquired a law degree by taking classes at night.

他通过上晚上的课获得了法律学位。

☆class 班；班级

A class is a group of students who are taught together.

class（班级）是一群一起学习的学生。

例：

He had to spend about six months in a class with younger students.

他不得不在一个比他小的学生的班上呆了大约六个月。

☆美国英语母语人士点评：

Lesson is normally what you're studying IN class, and class is just used to talk about the actual course you're taking. Lesson通常是指你在课堂上学习的内容，class只是用来谈论你所上的实际课程。
"Did you finish the lesson? It's due at the end of class." “你上完课了吗?这个课程结束时到期。”
"Which lesson are we doing in English class?" 我们在英语课上上哪一节课?”