存在于课堂上
It exists in the classroom
以上为机器翻译结果，长、整句建议使用 人工翻译 。
更重要的是，兼职可以给他机会超越他已经在课堂上讲授，他将学到的东西并不存在于图书，但在实践中。
What's more, the part-time job can offer him opportunities to go beyond what he's been taught in class, and he'll learn something that doesn't exist in books but in practice.
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