求翻译：Anyone who spends at least one semester in college notices that some students give up on their classes. The person who sits behind you in accounting, for ecample, begins to miss a lot of class meetings and eventually vanishes. Or another student comes to class without the assignment, doodles in a notebook during the lecture, and leaces during the break. What’s the difference between students like this and the ones who succeed in school? My survey may be nonscientific, but everything else-good study habits, smart time scheduling, and coping with personal difficulties.是什么意思？

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