18% of high school students use their phones at class.
18%的高中生则会在上课的时候使用手机。
When Herbert was young, he often made a face at class.
郝伯特小的时候，他常常上课做鬼脸。
Take the time to look at class descriptions and syllabi.
花点时间去了解课程内容和教学大纲。
He is always talking at class.
他上课时总是说话。
I'm very lazy. I never take notes at class.
我很懒惰，上课从来不记笔记。
Iam always sleepy at class because of my lack of sleep.
我天天睡眠不足，上课总觉得非常困。
Can you understand all the Chinese the teacher says at class?
上课的时候老师讲的中文你都听得懂吗?。
Student performance at class is based on attitude, completion of assignments and so on.
第二条、平时成绩以学生上课认真程度及作业完成等综合表现情况为依据。
Attendance at class and participation is essential and constitutes 20% of course grade.
课堂出席率及参与为基本要求，占总成绩20%。
Attendance at class and participation is essential and constitutes 20% of course grade.
课堂出席率及参与为基本要求，占总成绩20%。
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