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51. | historical trend |
| 历史趋势 |
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52. | persistent trend |
| 持续趋势 |
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53. | geometric trend |
| 几何趋势 |
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54. | on the downside |
| 下降趋势 |
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55. | corrosion tendency |
| 腐蚀趋势 |
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56. | The tendency of the world situation |
| 世界趋势 |
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57. | formation tendency |
| 地层趋势 |
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58. | determining tendency |
| 决定趋势 |
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59. | irregular trend |
| 不规则趋势 |
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60. | environmental trend |
| 环境趋势 |
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