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| 31. | construct puzzles |
| 解难题 |
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| 32. | He has honestly studied history. |
| 他实实在在地钻研历史。 |
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| 33. | tackle a difficult problem |
| 对付难题 |
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| 34. | That's the problem. |
| 这是难题。 |
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| 35. | engineering roadblock |
| 工程难题 |
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| 36. | a difficult question |
| 一个难题 |
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| 37. | explain puzzles |
| 解释难题 |
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| 38. | paradox of voting |
| 投票难题 |
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| 39. | do a puzzle |
| 解决难题 |
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| 40. | He still worked at his biology. |
| 他仍然钻研他的生物学。 |
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