求翻译：这时，运载火箭已获得很大动能，在地球引力作用下，开始进入惯性飞行段，一直到与卫星预定轨道相切的位置，第三级火箭发动机开始点火，进入最后加速段飞行。是什么意思？

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By now, the launch vehicle has obtained the very big kinetic energy, under the earth gravity function, starts to enter the inertia flight phase, arrives continuously with the satellite trajectory contacting position, the three-stage rocket engine starts to ignite, enters the final acceleration leg f

At this time, the launch vehicle has the large kinetic energy, under the action of gravity, entered the coast until the tangent to the satellite orbit location, the third-stage rocket engine start ignition, the final accelerated flight.

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