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| 21. | morphologic prominence |
| 地貌起伏 |
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| 22. | fluctuation of attention |
| 注意起伏 |
|
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| 23. | rolling terrain |
| 起伏地区 |
|
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| 24. | statistical fluctuation |
| 统计起伏 |
|
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| 25. | background fluctuation |
| 背景起伏 |
|
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| 26. | fluctuation of medium |
| 介质起伏 |
|
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| 27. | sound field fluctuation |
| 声场起伏 |
|
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| 28. | electric fluctuation |
| 电起伏 |
|
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| 29. | fluctuation of density |
| 密度起伏 |
|
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| 30. | sound intensity fluctuation |
| 声强起伏 |
|
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