短語詞組短語rocket -engine firing 火箭發(fā)動機點火試驗compound rocket -engine 復(fù)合火箭發(fā)動機Solid rocket pulse engine 固體火箭脈沖發(fā)動機rocket ramjet engine 火箭沖壓發(fā)動機rocket t engine 火箭發(fā)動機 返回 rocket engine