是为了让火箭的速度足够快,足以逃离地球的引力。
It is to get the rocket going fast enough to escape Earth's gravity.
虽然木星不能够把地球从围绕太阳旋转的轨道上拉出来,但是它对地球的引力也产生了相当大的作用。
Though Jupiter is not able to draw the earth out of its course round the sun, yet it attracts the earth to some extent.
逃逸速度就是一个物体的速度,比如说,从加农炮中射出的最小初始速度,这样这个物体以后就可以自己脱离地球的引力。
Escape velocity is simply the speed of an object that's shot out of a cannon the minimum initial speed so that the object could later escape Earth's gravity on its own.
But gravity has a remarkable property that the pull of the Earth is itself proportional to the inertia of the object.
重力有一个显著特征,即地球的引力,与物体的质量成比例
Why should the amount by which you're attracted to the Earth be also a measure of how much you hate acceleration?
为什么物体受地球引力的大小,恰好能衡量物体加速的难易程度呢
The poet, after all, is subject to gravity in Frost, to the force of the earth.
这个诗人,弗罗斯特,终究还是受制于地心引力,受制于地球的力量。
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