讲解文本：
bad-mouth 严厉批评，说坏话，恶意攻击 Why do you always bad-mouth my friends? 你为什么总说我朋友的坏话？ I don't think it's right to bad-mouth others. So don't do it. 我认为说别人坏话是不对的，你最好别这样做。
疯狂练习吧！
