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下面级
| 固体火箭发动机
| 下面级 | |
| space | lower stage |
| 固体 火箭发动机 | |
| gen. | Solid Rocket Motor |
| astronaut. | solid engine |
| space | solid propellant rocket engine; solid propellant rocket motor; solid propellant motor |
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| lower stage | |||
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下面级 : 2 phrases in 1 subject |
| Space | 2 |
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