月球的引力是地球引力的六分之一,所以嫦娥四号的实验是一个测试:地球上的植物能知道月球上哪个是向上的方向吗?
The moon's gravity is a sixth as strong as the earth's, so Chang'e-4's experiment was a test: would the earth plants know which way was up on the moon?
地球引力减缓了月球的自转速度,使之与其轨道的速度相匹配。
The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.
卫星以11.2千米每秒的速度前进可以脱离地球引力,这被称为“逃逸速度”。
Eleven point two kilometers per second, at which satellites can be freed from the gravitation of the earth, is called "escape speed".
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
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
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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