Otherwise gravity will pull you back down to the Earth.
否则，地心引力会把你拉回地球。
The gravity on Mars is a third of that on Earth.
火星的重力是地球的1/3。
Why Is Gravity in Space Not the Same as Earth?
为什么引力在太空和在地球上一样？
If you ask one simple question, why there is gravity in the Mother Earth?
如果你问一个人简单的问题，为什么地球母亲有重力？
Gravity exerts a natural pull straight downwards, towards the centre of the earth.
地心引力施加一个垂直向下，指向地球中心的自然拉力。
Gravity exerts a natural pull straight downwards, towards the center of the earth.
地心引力施加一个垂直向下，指向地球中心的自然拉力。
My muscles were used to the gravity of Earth.
我的肌肉已经习惯了地球万有引力。
The earth is round because of gravity.
地球是由于重力而成为球形的。
The gravity on Mars is only about three-eighths of that on Earth.
火星引力大约只有地球引力的八分之三。
It's because we leave the pull of gravity that comes from the earth.
这是因为我们离开了来自地球的地心引力的拉力。
It is gravity that keeps us from falling off the earth.
是重力使我们不至于从地球上抛出去。
Such as that the gravitational pull of the earth, "gravity" is wrong.
说那个地球的吸引力问题，“万有引力”也是错误的。
Earth gravity mechanism for plate motion is investigated primarily.
初步探讨了板块运动的地球重力学机制。
But for gravity, things on earth will fly into the air.
要是没有引力，地球上的东西会飞到天上去。
The force of Gravity makes things fall to earth.
地球引力使物体落到地面上。
All objects are pulled towards the centre of the Earth by the force of gravity.
所有的物体都由于引力而拉向地球中心。
The earth is round because of gravity .
地球是由于重力而成为球形的。
What would happen if the gravity on Earth was suddenly turned off?
如果地球引力突然消失会发生什么情况？
The first experiment had nothing whatever to do with gravity, the attraction of the earth.
第一个实验跟重力，即地球的引力无关。
He quickly learns that gravity on Mars is much less than on Earth.
他很快知道了火星上的万有引力比地球上小很多。
The lunar gravity is about one-sixth that on earth.
地心吸力把物体吸向地心。
The earth has that much material, gravity is great, this is also our feet on the ground can not fly out space cause.
地球有那堋多的物质，引力就很大了，这也是我们站在地面不会飞出太空的原因。
If the earth had no gravity, the moon would fly to the sun.
如果没有地球引力，月亮就会飞向太阳！
That the earth has gravity is clear.
很清楚地球是有引力的。
Gravity on the moon is six times weaker than on Earth.
月球上的重力比地球弱六倍。
In the absence of gravity, there would be no air around the earth.
没有重力，地球周围就没有空气。
The force of gravity on the moon is much less than on the earth .
月球的引力比地球上的引力小得多。
The force of gravity on the moon is much less than on the earth .
月球的引力比地球上的引力小得多。
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