During the early period of rocket development,China had established a rocket mechanical model and,in addition,had determined various external forces (such as engine thrust and aerodynamics) during the process of flight.是什么意思_During the early period of rocket development,China had established a rocket mechanical model and,in addition,had determined various external forces (such as engine thrust and aerodynamics) during the process of flight.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句