突如其来（通常是不愉快的事情）
本意是“晴天霹雳”，指蓝天中突然打下来的闪电。
e.g. One day, out of the blue, she announced that she was leaving.
突如其来（通常是不愉快的事情）
本意是“晴天霹雳”，指蓝天中突然打下来的闪电。
e.g. One day, out of the blue, she announced that she was leaving.
Out of the blue突如其来（通常是不愉快的事情）本意是“晴天霹雳”，指蓝天中突然打下来的闪电
- Out of the blue
突如其来（通常是不愉快的事情）
本意是“晴天霹雳”，指蓝天中突然打下来的闪电。
e.g. One day, out of the blue, she announced that she was leaving.
