求翻译：曾经有人做过一个调查，发现来课堂旁听的人，除了复习考研以及准备参加北大成教或自考的学生，还有很多是社会人士，有的人已参加工作，但更多的人生活窘迫，没有工作，他们都对求知充满激情。在课堂上，他们积极思考，并参与辩论，不仅活跃了课堂气氛，而且他们不同的行业背景也使课堂知识更加多彩。有条件开放课堂，既可以合理调配学校资源，又给了好学者一个机会，何乐而不为？是什么意思？

It has been done a survey and found that people who attend to the classroom, in addition to review and prepare to participate in PubMed or Self Beijing University students in adult education, there are many of the community, some people have to work, but more people live distress, no work, they are

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Some people have made an investigation, discovered classroom audit the human, takes exams for postgraduate schools except the review as well as prepares to participate in Beijing University Cheng Jiaohuo from the student who tests, but also has very many was the public figures, some people started t

There was the one who did a survey, found that Class Attendance people, in addition to review articles by, and be prepared to participate in the North or self-taught students of adult education, there are many of them are members of the community, some people have participated in the work, but more

Someone make one investigation ever, find come person that classroom audit, review prepare for the postgraduate qualifying examination and plan join Peking University become teach or student of the self-study examination, a lot of are social personage, some people have already worked, but more perso