Um, it has to do with the orbital ellipses of the planets... and a very concerted effort on the part of the scientists, as well as ourselves... to increase the speed of the ship using not only the earth's gravitational pull... but Venus as well.
这个，它必须做与轨道 行星的省略号. . 和部分非常协调一致的努力 科学家们，以及我们自己.