-
Obama has committed $3 billion for NASA to develop the heavy-lift-launch vehicle.
奥巴马已经承诺为美国航空航天局提供30亿美元，用于开发重型飞船火箭驱动装置。
youdao
-
Obama has committed $3 billion for NASA to develop the heavy-lift-launch vehicle.
奥巴马已经承诺为美国航空航天局提供30亿美元，用于开发重型飞船火箭驱动装置。
youdao