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51. | elementary fibril |
| 原纤丝 |
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52. | elementary cooperation |
| 初级合作社 |
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53. | elementary displacement |
| 单元变位 |
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54. | elementary formula |
| 原始公式 |
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55. | elementary divisor |
| 初等因子 |
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56. | elementary event |
| 基本事件 |
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57. | elementary econometrics |
| 初等经济计量学 |
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58. | elementary flow |
| 基本流量 |
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59. | Elementary English |
| 《初级英语》(期刊) |
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60. | elementary item |
| 基础项目 |
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