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61. | secondary fluctuatio |
| 次起伏 |
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62. | fluctuation theory |
| 起伏理论 |
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63. | fluctuation voltage |
| 起伏电压 |
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64. | topographic inequality |
| 地形起伏 |
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65. | optical path fluctuation |
| 光程起伏 |
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66. | submarine relief |
| 海底起伏 |
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67. | heave of the sea |
| 波浪起伏 |
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68. | undulating coast |
| 起伏海岸 |
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69. | heaving and dipping |
| 上下起伏 |
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70. | mospheric fluctuatio |
| 大气起伏 |
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