class

There are thirty students in my English class this semester.

(Chinese) 这学期我的英语班里有三十名学生。

The teacher asked the class to open their textbooks to page fifty.

(Chinese) 老师要求全班同学把教科书翻到第五十页。

I have a history class at 9 a.m., followed by a biology lab.

(Chinese) 我上午九点有一节历史课，随后是生物实验课。

Students must attend every class to get full credit for the course.

(Chinese) 学生必须参加每一节课才能获得该课程的全部学分。