习惯用语The black ox has trod on sb's foot.1.灾祸已降到某人头上。2.某人已到老年。The black ox has trampled on sb's foot.1.灾祸已降到某人头上。2.某人已到老年。You cannot flay the same ox twice.1.[谚]一头牛不能剥两次皮。