没有树木，许多动物不能在地球上生活，人类在地球上生活也不容易。
Without trees, many animals can not live on the earth. It's not easy for man to live on the earth, either.
所以他根据事实推断，认为太阳中有一种元素在地球上还没有被发现。
So he put two and two together, and decided there was an element in the sun that hadn't been discovered here on the earth yet.
在地球上的许多地方，生长缓慢的古树森林已被砍伐一空，以供人类使用。
Across much of the planet, forests of slow-growing ancient trees have been cleared for human use.
电影《博物馆奇妙夜》改编自米兰·崔克的小说，生动地再现了恐龙在地球上漫步的世界。
Adapted from Milan Trenc's novel, the film Night at the Museum brings to life a world where dinosaurs wander the earth.
在地球上，移动的构造板块是一个主要的地质元素，对整个地表的动态变化至关重要，对吗？
Here on Earth, moving tectonic plates are a major geological element, just crucial for the whole surface dynamic, right?
相反，今天我们人类共同使用超过7000种不同的语言，而这些语言并不是随机分布在地球上的。
Instead, today, our species collectively speaks over seven thousand distinct languages, and these languages are not spread randomly across the planet.
相反，今天我们人类共同使用超过7000种不同的语言，而这些语言并不是随机分布在地球上的。
Instead, today our species collectively speaks over 7,000 distinct languages, and these languages are not spread randomly across the planet.
我们需要接受这个事实，在地球上的大部分地区，很少或根本没有处理的废物将有充分的理由用于农业。
We need to accept that fact across much of the planet, so waste with little or no treatment will be used in agriculture for good reason.
在地球上，他和一只狐狸交了朋友。
在地球上，空气总是在流动。
在地球上，重力有助于植物的茎“向上”生长，根“向下”生长。
On Earth, gravity helps a plant's stems and roots to find "up" and "down".
我开始明白为什么你在地球上这么不开心了。
他认为在地球上甚至可能会发现外星生命的痕迹。
He believes marks of alien life may even be found here on Earth.
他们应该要感恩，感谢我在地球上这么多人里找了他们来替我洗衣做饭、服侍我。
They should be grateful that I selected them, of all the people on Earth, to wash my clothes and cook my meals and entertain me.
动物和人类在地球上共享空间，所以与我们周围的动物保持健康的关系，符合我们的最大利益。
Animals and humans share space on Earth, so keeping a healthy relationship with animals around us is in our best interest.
由于探测器距地球3.2亿公里，如果研究小组在地球上控制探测器，会有10分钟以上的信号延迟。
As the probe is 320 million km away from Earth, there is a signal delay of over 10 minutes if the research team tries to control it from Earth.
一些物体，比如一些旧的太空火箭或卫星碎片，在地球上以非常高的速度运动，速度如此之快，以至于一个非常小的碎片都能破坏重要的卫星或对宇航员造成危险。
Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts.
我们在地球上看到的其实是来自恒星的电磁辐射。
What we are seeing from earth is actually electromagnetic radiation that's coming from stars.
有趣的是，至少在地球上它需要强酸性的水来形成。
The interesting thing is that on Earth at least it needs highly acidic water to form.
“即使在地球上，两足机器人也很难在崎岖不平的地面上行走。”这位官员说。
"It is still difficult for a biped robot to walk on a bumpy surface, even on Earth," the official said.
当美国女宇航员琼·希金波坦不在太空飞行和工作时，她也许在地球上的某个地方发表演讲。
When US spacewoman Joan Higginbotham is not flying and working in space, she might be found somewhere on earth giving a speech.
来自南佛罗里达大学的西德尼·皮尔斯说：“在地球上，藻类的基因不可能在动物细胞内起作用。”
"There's no way on earth that genes from an alga should work inside an animal cell," says Sidney Pierce from the University of South Florida.
在地球上形成黄钾铁矾的其中一个步骤涉及到微生物；实际上，微生物能大幅加快黄钾铁矾的形成。
One step in its formation on Earth involves microorganisms; they actually speed up the formation of jarosite dramatically.
任何人只要有这样一块十进制表，再加上能看到地平线以上太阳的高度，就会立刻知道他在地球上的位置。
Any observer with a decimal chronometer and a view of the sun's height above the horizon would then know instantly where on the planet he was.
我们都听说过孤独而英勇的探险家的故事，但是在地球上许多不同地方引导和保护欧洲探险家的当地人呢？
We have all heard tales of lone, heroic explorers, but what about the local individuals who guided and protected European explorers in many different parts of the globe?
在1960年之前，地质学家鲍温和赫斯在地球上是否存在产生富含镁的岩浆所需的高温这一问题上存在分歧。
Prior to 1960, geologists Bowen and Hess disagreed over whether or not the very high temperatures needed to produce magmas rich in magnesium could have existed on Earth.
在地球上，人们认为，表明太阳黑子周期最可靠的迹象之一是树木的生长速度，就像树干横截面上可见的年轮一样。
On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.
因此，在地球上生命开始的时候，我们所看到的金星是一片温暖的海洋，这片海洋可能富含在岩石海岸和火山口周围飞溅的有机分子。
Thus, our picture of Venus at around the time life was getting started on earth is one of warm oceans, probably rich with organic molecules splashing around rocky shores and volcanic vents.
胚芽植物或后生植物是在地球上形成植被的最常见的绿色植物王国。
The Embryophyta, or Metaphyta, are the most familiar subkingdom of green plants that form vegetation on earth.
这如同幽灵的粒子在地球上畅通无阻。
The ghostly particles pass through our planet totally unimpeded.
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