MR. CHEN: The U.S. Army has begun research on the Force XXI and the Army After Next for several years. What is the main purpose and highlights of this research?是什么意思_MR. CHEN: The U.S. Army has begun research on the Force XXI and the Army After Next for several years. What is the main purpose and highlights of this research?在线翻译_英语_读音_用法_例句