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91. | variation calculus |
| 变分学|变分法 |
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92. | month variation |
| 月变异差 |
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93. | sidereal variation |
| 恒星变化 |
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94. | variation works |
| 修订工程 |
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95. | rhythmic variation |
| 节律变化 |
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96. | polar variation |
| 极变化 |
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97. | cryptic variation |
| 隐微的变异 |
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98. | variation movement |
| 回归性运动 |
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99. | physical variation |
| 效能差异 |
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100. | areal variation |
| 地区差异;地域差异 |
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