| 1. | That's a lesson for life. |
| 那是终生难忘的教训。 |
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| 2. | If he did not stop his nonsense, they would teach him a lesson he would never forget. |
| 如果他再不停止胡言乱语，他们就要狠狠地教训他一番，叫他终身难忘。 |
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| 3. | The war has branded an unforgettable lesson on our minds. |
| 战争在我们心上烙下了永志难忘的教训。 |
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| 4. | It taught him a lesson he never forgot. |
| 这给了他一个终生难忘的教训. |
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