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| 51. | time of occurrence |
| 发生时刻; 潜伏期 |
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| 52. | number of occurrence |
| 反复次数 |
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| 53. | an adventitious occurrence |
| 偶发事件. |
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| 54. | Details of Occurrence: |
| 事件发生详情: |
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| 55. | Accident (Crash) Occurrence |
| 事故发生 |
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| 56. | occurrence of spark |
| 火花的产生 |
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| 57. | an unexpected occurrence |
| 没料到的事 |
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| 58. | any one occurrence |
| 任意事件 |
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| 59. | frequency of occurrence |
| 出现次数 |
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| 60. | Harris'geologic occurrence mode |
| 哈里斯地质产状模型 |
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