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| 21. | That's the problem. |
| 这是难题。 |
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| 22. | engineering roadblock |
| 工程难题 |
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| 23. | explain puzzles |
| 解释难题 |
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| 24. | The newspaperman summarized the crux of the aerodynamic phenomenon. |
| 记者总结了空气动力现象之谜。 |
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| 25. | do a puzzle |
| 解决难题 |
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| 26. | paradox of voting |
| 投票难题 |
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| 27. | a difficult question |
| 一个难题 |
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| 28. | What then is the crux of the matter? |
| 那末，什么是我们的问题的中心呢？ |
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| 29. | construct puzzles |
| 解难题 |
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| 30. | Now we come to the crux of the problem. |
| 现在我们来谈问题的 结所在. |
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