You may also want to sit in and observe the class that interests you.
你也可以找个地方坐下，仔细看看你感兴趣的课程。
The middle class is a buffer layer in the structure of social interests.
中间阶层是社会利益结构中的缓冲层。
During the whole class, both students and the teacher had strong interests in the class.
整个授课过程中，学生和听课老师都保持着高昂的学习兴趣。
During the whole class, both students and the teacher had strong interests in the class.
整个授课过程中，学生和听课老师都保持着高昂的学习兴趣。
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