你会交到有趣的朋友,但你只需要结交那些尊重你学生的承诺的朋友。
You will make interesting friends, but you need only keep the friends who respect your students' commitments.
当然公开的承诺是一个很大的动力,但你仍旧需要一个出于内在的。
Public commitment is a big motivator, of course, but you should have internal ones too.
但你要信守承诺,从不用它骂人。
But I'm holding you to your promise that you will never use it.
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