The Earth orbits in an ellipse.
地球沿椭圆形轨道运动。
The earth moves round the sun.
地球围绕太阳旋转。
The earth revolves on its axis.
地球环绕自身的轴心转动。
The earth rotates around the sun.
地球围绕太阳旋转。
The earth is illuminated by the sun.
太阳照亮地球。
When did mammals appear on the earth?
地球上的哺乳动物起源于何时？
The moon exerts a force on the earth.
月球对地球有引力。
People used to think the earth was flat.
人们曾经认为地球是平的。
The earth takes a year to orbit the sun.
地球绕太阳一周要一年的时间。
People used to believe (that) the earth was flat.
人们一度认为地球是平的。
The total forest cover of the earth is decreasing.
地球上森林覆盖的总面积正在减少。
The earth is almost 25 000 miles in circumference.
地球的周长大约为25 000英里。
Eighty million years ago, dinosaurs ruled the earth.
八千万年前，地球是恐龙的天下。
The ancients conceived the earth as afloat in water.
古人认为地球漂浮在水里。
Because the earth spins, it is not a perfect sphere.
因为地球旋转，所以它不是个完完全全的球体。
The new planet is about ten times the size of the earth.
这个新发现的行星大约是地球大小的10倍。
A Russian space capsule is currently orbiting the Earth.
一个俄罗斯太空舱目前正环绕地球飞行。
Mars takes longer to revolve on its axis than the earth.
火星自转一周的时间比地球长。
A new satellite has been put into orbit around the earth.
一颗新的人造卫星被送上了环绕地球的轨道。
The orbit of this comet intersects the orbit of the Earth.
这颗彗星的轨道和地球的轨道相交。
There is an asteroid on a collision course with the Earth.
有个小行星正处于可能与地球发生碰撞的航向上。
The moon exerts a force on the earth that causes the tides.
月球对地球的吸引力引起潮汐。
It was once thought that the sun travelled around the earth.
人们曾经认为太阳绕着地球转。
The age of the earth is reckoned at about 4 600 million years.
估计地球的年龄大约为46亿年。
The material can absorb outward-going radiation from the earth.
这种材料可以吸收地球向外辐射的能量。
The equator is an imaginary line around the middle of the earth.
赤道是一条假想的环绕地球腰部的线。
We were not altogether sure that the comet would miss the Earth.
我们不太确定这颗彗星是否会错过地球。
The ozone layer shields the earth from the sun's ultraviolet rays.
臭氧层保护地球不受太阳紫外线的辐射。
The satellite revolves around the earth once every hundred minutes.
该人造卫星每100分钟绕地球旋转一圈。
An eclipse happens when the earth and moon are in line with the sun.
地球和月亮与太阳处在一条直线上，日食就发生了。
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