If a child has experienced school bullying, even if they haven't spoken about it, there will almost certainly be signs. Don't wait for the child to主动开口; you can judge based on three types of signals: First,明显回避学校 (feeling nervous when mentioning school, low mood, sudden breakdown on Sunday night); second,身体和警觉性异常 (insomnia, stomach or headache, fear of crowds,敏感对身后动静); third,自我评价突然下降 (frequently saying "I can't do it" or "I'm so embarrassing" but unable to explain why). If two or more of these signs appear, don't hesitate any longer. The order of handling is very important: don't逼问细节; first明确告诉孩子“不是你的错”; avoid中立分析, clearly站在孩子一边; first修复安全感, then discuss投诉或转班; external communication and problem-solving should be handled by parents. True recovery isn't about让孩子学会忍, but about让他确信, the danger has ended, and有人会为他挡在前面.