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41. | trend variation |
| 趋势变量 |
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42. | intermediate trend |
| 中间趋势 |
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43. | decelerating trend |
| 放缓趋势 |
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44. | downward trend |
| 下降趋向;下降趋势 |
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45. | curvilinear trend |
| 曲线趋势 |
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46. | trend extrapolation |
| 趋势线外推 |
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47. | nonexponential trend |
| 非指数趋势 |
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48. | accelerating trend |
| 加快态势 |
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49. | productivity trend |
| 生产力趋势 |
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50. | technical trend |
| 技术动向 |
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