短语词组短语roof -fall accident 冒顶事故face roof -fall 端面冒顶roof to fall in 灾难降临analysis of roof -fall 冒顶分析fault roof -fall area 断层冒顶区crush roof fall 压垮型冒顶thrust roof fall 推垮型冒顶Warning roof fall 当心冒顶 返回 roof fall