first-stage flight的意思|示意

NASA needs good weather to launch Ares I-X because engineers need to see the rocket flight all the way through first stage separation, which will mark the end of the test.

NASA需要好天气来发射战神I-X，因为工程师们要在第一级火箭分离前观测火箭飞行全过程，第一级火箭分离标志着试飞的结束。

The 1-x will climb about 40km (25 miles) into the sky during the powered phase of its flight, continuously measuring vehicle aerodynamics, controls and performance of the rocket's first stage.

战神一号X型将上升到约40公里(约25英里)的高空，在其动力飞行阶段，将不间断地对其运载空气动力学指标、火箭的第一阶段的控制和表现进行测量。

SpaceX will attempt the recovery of morefirst stages after the CRS-3 flight, with Musk indicating that SpaceX's goal is"to recover the first stage on all CRS flights and really on most flights."

SpaceX将在CRS -3的飞行后尝试更多的第一级回收， 同时穆斯克表示，SpaceX的目标是“在所有的CRS飞行上和事实上的大多数飞行上回收第一级。

Because the missile does not have establishing or controlling surfaces, it completely relies on the swinging nozzles of its first stage engine to maintain its course of flight.

因为导弹没有稳定或控制翼面，它完全地依靠在第一级发动机的摆动喷嘴去维持它的飞行航线。