本文作者： 21ST
IT’S 3 o’clock in the morning, and the phone is ringing. Zhang Mingzhen sits up to answer it. It is only when she starts to wake up that the 21-year-old student adviser hears wild laughter. At the other end of the line is a student playing a trick on his teacher. But instead of reacting angrily, Zhang smiles and tells the student to go back to bed.