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71. | piston-like movement |
| 活塞式推进 |
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72. | efficiency of propulsion |
| 推进效率 |
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73. | To drive forward;propel. |
| 推动,推进 |
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74. | ionic propulsion |
| 离子推进 |
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75. | electromagnetic propulsion |
| 电磁推进 |
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76. | frontal advance |
| 前缘推进 |
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77. | driving surface |
| 推进面 |
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78. | intermittent propulsion |
| 断续推进 |
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79. | electric propulsion |
| 电推进 |
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80. | thrust performance |
| 推进特性 |
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