When did the mammals appear at the earth?
哺乳动物是什么时候出现在地球上的？
An odd expression came into his face and he began to scratch at the earth.
他的脸上出现了一种奇怪的表情，然后他开始刨土。
现在来看地球。
It is so distant the moon arrives at the earth?
还是月球到地球那么远？
Grow up, we like to head down, looking at the earth.
成长时，我们喜欢低着头，望着大地。
We couldn't help looking at the earth again and again.
我们忍不住再三地看着地球。
It was great to see you at the Earth Day bicycle event!
在地球日单车上路真高兴看到你。
Theyare the first people in China who once looked at the earth from the space.
他们是从太空看到地球的第一批中国人。
At the earth, it can limitless from remote control, any electric apparatus of remote control.
在地球上，它可以无限距离遥控，遥控任何一个电器。
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。
After a week at sea, it was good to feel the earth beneath our feet again.
出海一周后，重新踏上陆地感到很愉快。
It will travel around the Earth at a height of 300 km.
它将在300千米的高度绕地球运行。
At this answer, the Pigeon flew swiftly down to the earth.
听到这个回答，鸽子迅速地飞向地面。
The second is: how did they get to Earth at such speed?
其二，它们如何以如此急速到达地球？
The second map shows Earth at the time of launch. That's time zero.
第二幅地图显示了没有时间显示的地球形成时期。
But the earth behaves as if all its matter were at its center.
但地球的行为方式好像是，它所有的物质都集中在它的中心。
That, at least, is the proverb on Earth.
这在地球上至少是个谚语。
The rate at which species are disappearing from Planet Earth is horrifying.
地球上的物种正以惊人的速度从这个星球上消失。
At some point, the earth or sea look dangerously close through the window.
有时，大地或海洋通过就近机窗看去，很是危险。
Let's make this year different. Will yours be a resolution for saving the earth or at least a step in the green direction?
让我们使明年有所不同，你的新年决心将会是拯救地球的决心或者至少是进一步地走向绿色环保方向的决心吗？
The most powerful nation on earth was at peace.
这个地球上最强大的国家看上去一切风平浪静。
Soon, the spaceship left Earth, and everyone looked down at the burning planet.
很快，飞船离开了地球，大家俯视着下面这颗燃烧着的星球。
At 8:30 local time, soon after this picture was taken, the district went dark in support of the world's third Earth Hour.
在当地时间的8点30分(即如下图所示)，为支持第三个地球一小时活动日，整个街区变暗了。
We take a look at six of the biggest monsters of earth moving.
我们不妨来看看以下这六款最大移土怪物。
Look at the photograph of the Earth again.
再次看地球的照片。
The other, at just 1.4 Earth masses, would be the least massive exoplanet yet, if confirmed.
另一颗约有地球1.4倍的质量，如果该推测被证实的话，这将是迄今为止最小质量的外系行星。
For instance, you're at a particular position around the Earth, here at a satellite.
例如你在环绕地球的，某一点，这一个卫星。
It seemed that there was nothing to worry her at all on the earth!
在这个世界上啊，似乎根本没有什么事情会使她担忧啊！
It seemed that there was nothing to worry her at all on the earth!
在这个世界上啊，似乎根本没有什么事情会使她担忧啊！
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