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| 串联式助推火箭 | |||
| 串联式助推器 | |||
| 轴向助推器 | |||
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| 串联〔轴向〕助推器〔助推发动机〕; 串联助推 | |||
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tandem boost : 3 phrases in 2 subjects |
| Space | 2 |
| Technology | 1 |
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