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?
首先,他要在自己的实验中排除地球引力的影响。
His first care was, to render the attraction of the earth an inefficient element in his experiment. He did it in the following way.
对地球引力的研究表明,在不寻常的负荷之下地壳和地幔会发生位移。
Studies of thegravity field of the Earth indicate that its crust and mantle yieldwhen unusual weight is placed on them。
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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