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51. | space propultion |
| 空间推进 |
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52. | spacecraft propulsio |
| 航天器推进 |
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53. | auxiliary propulsion |
| 辅助推进 |
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54. | atomic propulsion |
| 原子推进 |
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55. | propulsion trial |
| 推进试验 |
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56. | TJP (Turbojet Propulsion) |
| 涡轮喷气推进 |
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57. | propulsive horsepower |
| 推进马力 |
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58. | advance of ice cover |
| 冰层推进 |
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59. | propulsive performance |
| 推进性能 |
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60. | solar propulsion |
| 太阳能推进 |
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