perfect storm
noun [singular] (especially North American English)an occasion when several bad things happen at the same time, creating a situation that could not be worse 祸不单行；屋漏偏逢连夜雨 The company blamed a perfect storm of bad trading conditions for a 90 per cent fall in profits. 该公司将利润下降90%归咎于糟糕交易条件的完美风暴。 The company was hit by a perfect storm of negative conditions that converged on it. 该公司遭受了一系列不利因素互相叠加的严重打击。