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.
飞行器仍在地球引力的影响下，它飞向月球时开始减速。
An apparatus in which human beings or animals are enclosed and which is revolved to simulate the effects of acceleration in a spacecraft.
对地球引力的研究表明，在不寻常的负荷之下和会发生位移。
Studies of the gravity field of the Earth indicate that its and yield when unusual weight is placed on them.
直到最近，他们才能够制造出足以克服地球引力的强有力的机器。
It is only recently that they have been able to build machines powerful enough to get out of the Earth's gravitational pull.
我们惊奇地看到，随着地球引力的增加，宇宙飞船的外层燃烧起来。
We watched, amazed as fire broke out on the outside of the space ship as the gravity increased.
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。
发源自月球表面以下几英里的轻微月震据估计是由地球引力的牵引造成的。
Small moonquakes, originating several kilometers below the surface, are thought to be caused by the gravitational pull of Earth.
有时候我想地球引力的发现也许应该归功于那几只落在牛顿头上的苹果。
Sometimes I think the discovery of gravitation perhaps should be credited to those apples falling on Newton's head.
下落的感觉大概取决于视觉和气流的暗示，以及来自那些直接感觉地球引力的器官的信息。
The perception of falling probably depends on visual and wind cues along with information from the organs that sense gravity directly.
钙晶体的运动向大脑发出信号使我们感知地球引力的方向，但这不是大脑接收到的惟一信号。
The movement of the calcium crystals sends a signal to the brain to tell us the direction of gravity. This is not the only cue the brain receives.
地球引力的持续和普遍的存在使我们在日常生活中很容易忽略它，但我们的身体从未忘记过它。
The continuous and universal nature of gravity removes it from our daily notice, but our bodies never forget.
对地球引力的主要影响来自太阳和月球，其他行星影响总和的最大值，不过是月球的万分之一而已。
The main influence on the earth's gravitation comes from the sun and the moon, while the aggregate influence of the other planets amounts at most to one ten thousandth of that of the moon.
斯图克利写道，牛顿告诉他，当年正是在这样的情景中，正是在苹果树下，他的脑子里迸发出了地球引力的概念。
Stukeley wrote that Newton told him the notion of gravity popped into the scientist's mind as he was sitting in the same situation.
他们发现在围绕着地球旋转了大约5000次之后，作为对地球引力的响应，陀螺仪的旋转角发生了极其微小的改变。
And they found that after circling the Earth some 5000 times the gyroscopes' Angle of spin had changed, ever-so-slightly, in response to the Earth's gravitational pull.
Skye是建在Unique酒店屋顶上的绚丽泳池，这座奢华酒店本身的建筑就有够特别，是违反地球引力的倒弧形。
Skye is the spectacular rooftop pool of Hotel Unique, a luxury boutique hotel built in the gravity-defying shape of an inverted arc.
他们提到的引力关键点是天文上的一个精确地带，仅仅微大于小行星本身，在那个点上地球引力的影响可以改变小行星运行的轨迹。
The gravitational keyhole they mention is a precise region in space, only slightly larger than the asteroid itself, in which the effect of Earth's gravity is such that it could tweak Apophis' path.
月球对地球的吸引力引起潮汐。
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".
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.
第二，地球会运动的观点不符合古希腊人对万有引力的理解。
Second, the idea of an Earth that moved didn't fit in with the ancient Greeks' understanding of gravity.
另一方面，像地球的卫星这种相对温暖、表面引力较小的天体，它们连最重的气体也无法容纳，因此也没有大气层。
On the other hand, a comparatively warm body with a small surface gravity, like Earth's moon, is unable to hold even the heaviest gas and thus lacks an atmosphere.
巨大的外行星的引力护盾虽然效率很高，但偶尔也会无法保护地球。
The gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth.
第三，巨大的外行星的引力屏障虽然非常有效，但偶尔也会无法保护地球。
Third, the gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth.
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.
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.
其中一个是地心引力的力量，这股力量试图把卫星拉向地球，就像一根把卫星绑住的绳子，防止卫星飞远了。
One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth and is like a rope which keeps the satellite from flying away.
太空船之所以能飞出地球，是因为其飞行速度很快，足以挣脱地球的引力。
A spaceship that reaches escape velocity is moving fast enough to break free of a planet's gravity.
太空船之所以能飞出地球，是因为其飞行速度很快，足以挣脱地球的引力。
A spaceship that reaches escape velocity is moving fast enough to break free of a planet's gravity.
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