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| 41. | done without tact or skill |
| 无策略的;无技巧的 |
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| 42. | There is no royalroad to learning. |
| 学无坦途，学问无捷径。 |
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| 43. | dimensionless performance |
| 无因次特性|无量纲特性 |
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| 44. | unfriended adj. |
| 无友人的；无依的 |
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| 45. | astomatous adj. |
| 无口的；无气孔的 |
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| 46. | contactless switching |
| 无接点转接|无接点开关 |
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| 47. | non dimensional coefficient |
| 无量纲系数无量纲?数 |
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| 48. | unfluted shaft of column |
| 无槽立柱;无槽柱身 |
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| 49. | non-poppled and non-trim system |
| 无泡无倾差系统 |
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| 50. | AC commutatorless and brushless motor |
| 交流无刷无换向器电动机 |
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