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51. | elementary concern |
| 初步关注 |
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52. | elementary analyzer |
| 元素分析仪 |
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53. | elementary education |
| 初等教育 |
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54. | elementary displacement |
| 单元变位 |
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55. | elementary mathematics |
| 基础数学. |
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56. | elementary area |
| 像点面积;像素面积;图像单元;元面积 |
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57. | elementary aerodynamics |
| 初级空气动力学 |
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58. | elementary cooperation |
| 初级合作社 |
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59. | elementary antenna |
| 单元天线;基元天线 |
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60. | elementary divisor |
| 初等因子 |
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