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| 51. | in times of; in periods of |
| 在..时期 |
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| 52. | At the time of a rough Beginning |
| 草创时期 |
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| 53. | Five Dynasties Period |
| 五代时期 |
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| 54. | Classical period |
| 古典时期 |
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| 55. | mineralization period |
| 成矿时期 |
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| 56. | a period of innovation |
| 革新时期. |
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| 57. | Palaeolithic period |
| 旧石器时期 |
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| 58. | antecedent date |
| 以往时期 |
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| 59. | fertilizing time |
| 施肥时期 |
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| 60. | Ciceronian period |
| 西塞罗时期 |
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