solid rocket booster
/ˈsɒlɪd ˈɹɒkɪt ˈbuːstə/
n
English · solid rocket booster中文 · 固体火箭助推器Español · cohete de combustible sólidoFrançais · fusée à propergol solide
意味：Solid-fuel thruster that provides most of the lift during the first few minutes of flight, after which it separates.