a lulu of a mistake

• 明显的错误； 大错误

a lulu of a mistake的用法和样例：

例句

1. I sensed that I had made a serious mistake.
   我意识到自己犯了个严重的错误。
2. He's bound to notice your mistake.
   他必定会觉察到你的错误。
3. He professed himself to have made a great mistake.
   他承认自己犯了大错误。
4. She made a classic boner and married a crook.
   她犯了一个大错误，嫁给了一个骗子。