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| 41. | elementary aerodynamics |
| 初级空气动力学 |
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| 42. | elementary theory |
| 初等理论|一阶理论 |
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| 43. | elementary volume |
| 体积单位 |
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| 44. | elementary area |
| 像点面积;像素面积;图像单元;元面积 |
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| 45. | elementary species |
| 【生】原种 |
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| 46. | elementary mathematics |
| 基础数学. |
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| 47. | elementary analyzer |
| 元素分析仪 |
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| 48. | elementary antenna |
| 单元天线;基元天线 |
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| 49. | elementary education |
| 初等教育 |
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| 50. | elementary concern |
| 初步关注 |
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