You always have to sit in the same room for three hours for multiple classes.
你必须在同一个房间为了多个课程坐三个小时。
Will they permit you to sit in on a few classes as an observer?
他们会允许你旁听几节课吗？
Sit in on two or three classes.
听两到三门课。
Try to sit in on related classes at your target school. This will enable you to become familiar with your potential professors and also have an insight into the key parts of your target course(s).
最好去想要报考的学校上相关的课程，这样既可以熟悉一下未来的教授，也能对将来要学课程的核心内容有更深刻的认识。
I used to sit in on lots of classes I hadn't even signed up for. And dorm life was terrific.
校园生活总是让人留恋，我曾经上了很多根本没有注册的课。
I used to sit in on lots of classes I hadn't even signed up for.
大学的生活很有趣，我常去旁听许多我没注册的课。
I used to sit in on lots of classes I hadn't even signed up for.
大学的生活很有趣，我常去旁听许多我没注册的课。
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