classis

例句：

1. 1. The class is studying the history of ancient Greece.
   这个班级正在学习古希腊的历史。
2. 2. He was a classmate of mine from high school.
   他是我高中时的同班同学。
3. 3. The teacher asked the class to raise their hands if they knew the answer.
   老师要求全班举手回答，如果他们知道答案。