retrorocket pack [航] 减速火箭发动机组
retrorocket engine 制动火箭发动机
retrorocket landing 用减速火箭着陆
deorbit retrorocket engine 脱离轨道用的制动火箭发动机
retrorocket unit [航] 制动火箭发动机
retrorocket system 制动火箭装置
retrorocket alignment 减速火箭调准
stage-separation retrorocket 级分离系统制动火箭
以上来源于: WordNet
N a small auxiliary rocket engine on a larger rocket, missile, or spacecraft, that produces thrust in the opposite direction to the direction of flight in order to decelerate the vehicle or make it move backwards 大型火箭、导弹或航天器上的备用发动机; 产生和航线反方向的猛推，以使其减速或向后退 (Often shortened to retro)
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