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41. | background fluctuation |
| 背景起伏 |
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42. | brightness fluctuation |
| 亮度起伏 |
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43. | concentration fluctuations |
| 浓度起伏 |
|
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44. | fluctuation of density |
| 密度起伏 |
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45. | flighting schedule |
| 起伏式 |
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46. | rolling terrain |
| 起伏地区 |
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47. | fluctuating signa |
| 起伏信号 |
|
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48. | sound field fluctuation |
| 声场起伏 |
|
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49. | fluctuation of attention |
| 注意起伏 |
|
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50. | fluctuation of medium |
| 介质起伏 |
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