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81. | variation in daily rate |
| 日差变化 |
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82. | temporal and spatial variation |
| 时空变化 |
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83. | geomagnetic periodic variation |
| 地磁周期性变化 |
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84. | variation of field intensity |
| 场强变化 |
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85. | geomagnetic seasonal variation |
| 地磁季节变化 |
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86. | stitch length variation |
| 线圈长度变化 |
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87. | hourly variation factor |
| 时变化系数 |
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88. | paleoshore line variation |
| 古海岸线变化 |
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89. | variation of water level |
| 水位变化 |
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90. | storm-time variation |
| 暴时变化 |
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