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| 51. | variation movement |
| 回归性运动 |
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| 52. | cyclical variation |
| 周期性变动 |
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| 53. | daily variation |
| 每日变动 |
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| 54. | areal variation |
| 地区差异；地域差异 |
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| 55. | cryptic variation |
| 隐微的变异 |
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| 56. | variation calculus |
| 变分学|变分法 |
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| 57. | physical variation |
| 效能差异 |
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| 58. | variation works |
| 修订工程 |
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| 59. | polar variation |
| 极变化 |
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| 60. | unfree variation |
| 不自由变分 |
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