An ageing nuclear reactor is an accident waiting to happen.老化的核反应堆早晚会出事故。Children treat the road as a playground. It's an accident waiting to happen.孩子们拿马路当运动场，这样迟早会出事儿。It's an accident waiting to happen.发生这样的事故是迟早的事。My brother is the clumsiest person I know. He's just an accident waiting to happen.我弟弟简直笨透了。他就会惹祸。