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| 51. | At the time of a rough Beginning |
| 草创时期 |
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| 52. | Pleistocene period |
| 更新世时期 |
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| 53. | periodical series |
| 时期数列 |
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| 54. | mineralization period |
| 成矿时期 |
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| 55. | difficult times |
| 艰难困苦时期 |
|
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| 56. | fell upon difficult times |
| 困难时期 |
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| 57. | time for spraying |
| 喷雾时期 |
|
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| 58. | Five Dynasties Period |
| 五代时期 |
|
|
| | |
| 59. | amphibolic stage |
| 不稳定时期 |
|
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| | |
| 60. | Palaeolithic period |
| 旧石器时期 |
|
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