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| 21. | construct puzzles |
| 解难题 |
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| 22. | I need problems. A good problem makes me come alive. |
| 我需要难题。难题令我精神抖擞。 |
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| 23. | tackle a difficult problem |
| 对付难题 |
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| 24. | That's the problem. |
| 这是难题。 |
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| 25. | engineering roadblock |
| 工程难题 |
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| 26. | a difficult question |
| 一个难题 |
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| 27. | explain puzzles |
| 解释难题 |
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| 28. | paradox of voting |
| 投票难题 |
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| 29. | do a puzzle |
| 解决难题 |
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| 30. | give the correct answer or solution to. |
| 能够正确地解答问题。 |
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