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| 41. | difficult times |
| 艰难困苦时期 |
|
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| 42. | a period of existence or persistence |
| 持续时期 |
|
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| | |
| 43. | romantic period |
| 浪漫主义时期 |
|
|
| | |
| 44. | amphibolic stage |
| 不稳定时期 |
|
|
| | |
| 45. | observation period |
| 观测时期 |
|
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| | |
| 46. | periodical series |
| 时期数列 |
|
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| | |
| 47. | a period of economic prosperity. |
| 经济繁荣时期 |
|
|
| | |
| 48. | time for spraying |
| 喷雾时期 |
|
|
| | |
| 49. | Pleistocene period |
| 更新世时期 |
|
|
| | |
| 50. | fell upon difficult times |
| 困难时期 |
|
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| | |