Arrows would continue to fly forward forever in a straight line were it not for gravity, which brings them down to earth.
要不是重力使箭掉落地上，它将会一直沿直线往前飞行。
From the expressions on their faces, I realized the gravity of the situation.
从他们的脸部表情我晓悟到事情的严重性。
The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.
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。
As the nebula collapsed caused by its gravity, it spun faster and flattened into a disk.
当星云因其重力而坍缩时，它旋转得更快，并压扁成一个盘状。
The lower the gravity, the lesser the weight and the greater the height of the mountain.
重力越低，重量越小，山的高度就越高。
Structures can be analyzed in terms of how they deal with downward forces created by gravity.
人们根据建筑物如何处理由重力产生的向下的力来分析它们。
The great height of Martian volcanoes is a direct consequence of the planet's low surface gravity.
地球表面低重力直接导致了火星上火山的巨大高度。
Every plant on the disk had responded to the pull of gravity, and pointed its roots to the outside.
每一株盘子上的植物都能感受到重力的作用，根部都朝外面生长。
Second, the idea of an Earth that moved didn't fit in with the ancient Greeks' understanding of gravity.
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。
Within the molten interior, under the influence of gravity, different elements were sorted out by density.
在熔体内部，在重力的影响下，（研究人员）根据密度对不同元素进行了分类。
Deformation is more likely to occur the thicker the ice is, because of the gravity of the weight of the ice.
越厚的冰越容易发生变形，是由冰的重量产生的重力造成的。
Over billions of years, the gas was compressed by gravity into galaxies, stars, plants and eventually, even humans.
在数十亿年的时间里，这些气体被引力压缩成星系、恒星、植物，最终甚至变成了人类。
Jeanne conducted more than 200 interviews with people from organisations with potential interests in gravity studies.
珍妮对这些人进行了200多次的采访，他们来自那些可能对重力研究感兴趣的组织。
Sleeping on the front will help to prevent snoring, as the muscles of the throat will not sag backwards under gravity.
俯卧睡可以有助于防止打呼，因为这时候喉咙处的肌肉不会因为重力原因而下垂到后方。
This material gradually coalesced into lumps called planetesimals as gravity and chance smashed smaller pieces together.
随着重力和机会将较小的碎片粉碎在一起，这种物质逐渐聚集成块状，被称为天体。
As there is no gravity, you can't stand and any slight push can result in tragedy you can be pushed into space, never be back.
因为没有重力，你无法站立，任何轻微的推力都可能导致悲剧，你可能被推到太空中，再也不会回来。
An apple four hundred years ago led to the law of gravity while the apple designed by Steve Jobs has changed our life greatly.
四百年前的一个苹果带来了万有引力定律，而史蒂夫有·乔布斯设计的苹果大大地改变了我们的生活。
Without gravity to help circulate air, the carbon dioxide you exhale has a tendency to form an invisible cloud around your head.
如果没有重力帮助空气循环，你呼出的二氧化碳会在你头顶周围形成一个看不见的云状物。
The rest of the concept relied on gravity, which guaranteed that the surface of the molten metal was perfectly flat and horizontal.
其余的概念依赖于重力，它保证了熔融金属的表面是完全平坦和水平。
To counter these effects on a long-duration mission, say, Mars, astronauts will certainly need to create their own artificial gravity.
比如在火星上，为了在长期任务中对抗这些影响，宇航员肯定需要人为制造重力。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob.
四种基本力（万有引力、电磁力、强核力和弱核力）中的每一种都有一个理论上的旋钮。
Most astronomers believe that the large concentration of mass at the galaxy's center is a black hole whose gravity is causing the gas to whirl.
大多数天文学家认为，星系中心的大量物质是一个黑洞，它的引力导致气体旋转。
Words like "acid", "gravity", "electricity" and "pendulum" had to be invented just to stop their meetings turning into an endless game of charades.
像“酸”，“重力”，“电”和“钟摆”这些词不得不被发明出来，只是为了防止他们的会议变成一场无止尽的字谜游戏。
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.
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。
Data collected in 1994 by the Clementine spacecraft show that many of these lunar basins have no anomalously low gravity and some even have anomalously high gravity.
1994年由克莱门蒂号航天器收集的数据显示，这些月球盆地没有异常的低重力现象，有些甚至有异常高的重力。
More importantly, scientists are already queuing for seats on these low-gravity space-flight services so they can collect data during a few minutes of weightlessness.
更重要的是，科学家们已经在排队争取这些低重力太空飞行服务的座位了，这样他们就可以在几分钟的失重状态下收集数据。
Because the surface of the water table is not flat but instead rises and falls with topography, groundwater is affected by gravity in the same fashion as surface water.
由于地下水位不是平面的，而是随着地形起伏的，所以地下水和地表水一样受到重力的影响。
One thing that physiologists have learned is that without gravity our bodies begin to lose strength, leaving astronauts with weakened bones, muscles and cardiovascular systems.
生理学家发现，失去重力后身体会失去力量，这使得宇航员骨质疏松、肌肉松弛，心血管功能也相应退化。
Astronomers theorize that a black hole forms when a massive object shrinks catastrophically under its own gravity, leaving only a gravitational field so strong that nothing escapes it.
天文学家的理论是，当一个巨大的物体在其自身的引力作用下灾难性地收缩，只留下一个强大的引力场，且没有任何东西能逃脱时，黑洞就形成了。
Astronomers theorize that a black hole forms when a massive object shrinks catastrophically under its own gravity, leaving only a gravitational field so strong that nothing escapes it.
天文学家的理论是，当一个巨大的物体在其自身的引力作用下灾难性地收缩，只留下一个强大的引力场，且没有任何东西能逃脱时，黑洞就形成了。
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