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| 31. | secondary fluctuatio |
| 次起伏 |
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| 32. | fluctuation theory |
| 起伏理论 |
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| 33. | fluctuation voltage |
| 起伏电压 |
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| 34. | topographic inequality |
| 地形起伏 |
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| 35. | optical path fluctuation |
| 光程起伏 |
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| 36. | submarine relief |
| 海底起伏 |
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| 37. | heave of the sea |
| 波浪起伏 |
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| 38. | undulating coast |
| 起伏海岸 |
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| 39. | heaving and dipping |
| 上下起伏 |
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| 40. | mospheric fluctuatio |
| 大气起伏 |
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