Something, such as a startling or shocking piece of news, that is similar to a crash of thunder in suddenness or violence.
晴天霹雳似的消息或事件如惊人的消息等在突然性和猛烈性方面与一声响雷相似的东西
I know the suddenness of it must have been a dreadful shock; and I just can't tell you how sorry I am.
这一突然不幸对你一定是一沉重打击。我无法表达我的悲痛之情。