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案例:有段时间园长发现,有的班级组织教学用的铃鼓特别容易坏,常常用不到半个月,鼓面就坏了。开始,园长以为是质量问题,就去找卖主,可
Case: The headmaster found out for some time that some tutoring organizations in classrooms are particularly vulnerable to abuse. Often less than half a month, the drumhead is broken. At first, the principal thought it was a quality problem and went to find the seller