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例句：

1. 1. I made a mistake when I forgot to bring my umbrella.
   我忘记带雨伞时犯了一个错误。
2. 2.The teacher pointed out the mistake in the math problem.
   老师指出了数学问题中的错误。
3. 3.He admitted his mistake and asked for forgiveness.
   他承认了自己的错误并请求原谅。