1、
A rocket is propelled by the ejection of a portion of its mass to the rear.
火箭是靠向后喷射其部分质量而推进的.
词典精选例句
2、
The weapons included assault rifles, submachine guns and rocket-propelled grenades.
武器包括突击步枪 、 冲锋枪和火箭推进榴弹.
互联网摘选
3、
They are mortars , howitzers , cannons , long-range artillery, rocket guns and self-propelled guns.
是迫击炮、弹炮 、 浓炮、程火炮 、 箭炮、行火炮.
互联网摘选
