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auxiliary rocket▼noun[UK: ɔːɡ.ˈzɪ.liə.ri ˈrɒkɪt] [US: agˈzɪ.ljə.ri ˈrɑːkət]
booster rocket▼◼◼◼[UK: ˈbuː.stə(r) ˈrɒkɪt] [US: ˈbuː.stər ˈrɑːkət]
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