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61. | cyclical variation |
| 周期性变动 |
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62. | bounded variation |
| 有界变差 |
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63. | impressed variation |
| 强制变异 |
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64. | cryptic variation |
| 隐微的变异 |
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65. | Hesser's variation |
| 海塞尔变化 |
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66. | rhythmic variation |
| 节律变化 |
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67. | month variation |
| 月变异差 |
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68. | daily variation |
| 每日变动 |
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69. | sidereal variation |
| 恒星变化 |
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70. | physical variation |
| 效能差异 |
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