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| 21. | Momentous changes often occur. |
| 常常会发生巨大的变革。 |
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| 22. | "If anything should occur, ..." |
| 如果发生什么事情的话， |
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| 23. | Something about to occur. |
| 马上要发生的事物 |
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| 24. | occur at irregular intervals |
| 不定期发生 |
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| 25. | Break out; suddenly occur |
| 突然发生;爆发 |
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| 26. | Reasonably likely to occur |
| 相当可能发生的 |
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| 27. | Paradigm shifts occur slowly; |
| 任何一种定式的转变都是缓慢的； |
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| 28. | The games occur triennially. |
| 运动会每叁年举行一次. |
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| 29. | occur to sb's mind |
| 产生于某人的头脑中 |
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| 30. | strike on; occur to |
| 想出;冲撞 |
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