最根本的问题是，开发一种新授课顺序需要花费很长时间，上一年度的授课时间会变得非常少，因此，这种变化只能缓慢进行。
The basic problem is that it takes a long time to develop a new sequence of lectures and very little time to give last year's lectures, so things change only slowly.
由一个教授和十名学生每周会晤两三次，每次授课时间45到50分钟，是大学程度课堂教学的传统方式。
The traditional pattern of classroom experience at the college level brings the professor and a group of 20 to 30 students together for a 45-to-50-minute class session two or three times a week.
由一个教授和十名学生每周会晤两三次，每次授课时间45到50分钟，是大学程度课堂教学的传统方式。
The traditional pattern of classroom experience at the college level brings the professor and a group of 20 to 30 students together for a 45-to-50-minute class session two or three times a week.
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