We cannot emphasize the importance of protecting the environment too much because we have only one Earth.
再怎么强调保护环境的重要性也不为过，因为我们只有一个地球。
If we look at a star in January—when Earth is at one point in its orbit—it will seem to be in a different position from where it appears six months later.
如果我们在一月份观察一颗恒星——那时地球在其轨道上的一个点——它的位置似乎会与六个月后它出现的位置不同。
In the space of all possible lives, life on Earth is but a tiny sliver—one attempt at creativity.
在所有可能有生命存在的空间里，地球上的生命只占一小条――创造性的一次尝试。
Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie.
地球是内行星中唯一一个有大卫星的，它的轨道既不在地球的赤道平面上，也不在其他行星所在的平面上。
As one hemisphere of Earth tilts farther from the sun, the arc of the sun's daily path seen from that location lowers toward the horizon.
当地球一个半球距太阳的倾斜度更大时，从那个位置看到的太阳每日运行轨迹的弧线就会向地平线下降。
Although not the first brand to claim its advert can be viewed on Google Earth, the KFC logo is certainly one of the most ambitious.
虽然肯德基不是第一个声称能在谷歌地图上看到其广告的品牌，但它的商标无疑是最有野心的一个。
He also explains why he chose to devote his life to one of the smallest creatures on earth.
他还解释了为什么他选择把他的一身致力于地球上最小的生物之一。
So while on Earth we have several types of volcanoes, on Venus there's mostly the one type.
所以地球上的火山有好几种类型，而在金星上的火山只有一种。
If amino acids are found, it would be especially interesting if they show a prevalence of one type of handedness, either left, like amino acids on Earth, or right.
如果发现了氨基酸，并且它们普遍表现出同一种偏向性——要么像地球上的氨基酸一样是左旋的，要么是右旋的，那将会格外有趣。
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.
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。
Boss said it is possible, even likely, that most stars have at least one earth like planet, which he considers surprising.
博斯说，大多数恒星都有可能，甚至很有可能，至少有一颗类似地球的行星，他认为这是令人惊讶的。
But such transits have paved the way for what might prove to be one of the most vital breakthroughs in the cosmos—detecting Earth-sized planets orbiting other stars.
但是这样的凌日现象已经为被证明可能是宇宙中最重要的突破之一的说法铺平了道路，这个说法即找到那些围绕其他恒星轨道公转的和地球大小相似的行星。
Science fiction writers have long dreamed that humans might one day quit the earth to colonize other planets.
科幻小说作家们长期以来一直梦想着人类有一天可以离开地球移居到其它星球上。
They also think they can explain the bright flash seen from the earth earlier this month: it was a meteor, though a small one that didn't get very far.
他们还认为他们可以解释本月早些时候，从地球上看到的明亮闪光，尽管是很小的一颗流星，但没有飞多远。
They live in precarious balance and one of the toughest environments on earth.
他们生活在不稳定的平衡中，并且这是地球上最艰苦的环境之一。
Coral reefs are one of the most fragile, biologically complex, and diverse marine ecosystems on Earth.
珊瑚礁是地球上最脆弱、生态性最复杂、最多样化的海洋生态系统之一。
The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.
最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。
The change that is taking place on earth and in our minds is one of the greatest changes ever to take place in human affairs.
地球上和我们思想中正在发生的变化是有史以来人类事务中发生的最伟大的变化之一。
How do we know that the Earth is a smaller ball turning around one of those stars, the Sun?
我们怎么知道地球是一个更小的球，绕着其中一颗恒星——太阳转呢？
Not as she was one o' them as looked down on th' earth—not her.
她不会像瞧不起土地的人一样——她不会。
The molecules of carbon dioxide in the Earth's atmosphere affect the heat balance of the Earth by acting as a one-way screen.
地球大气层中的二氧化碳分子像一个单向屏一样影响着地球的热量平衡。
He studied the Namib beetle, an ingenious species that lives in one of the driest places on earth.
他研究了纳米布甲虫，这是一种灵巧的物种，生活在世界上最干燥的地方之一。
No-one had found a way to calculate accurate distances to the planets from the Earth.
还没有人找到方法来计算从地球到行星的精确距离。
He is always dreaming that he can fly to space to look at the earth one day.
他总是梦想着有一天能飞到太空中遥看地球。
Earth was already in one of its warm interglacial periods when we started burning fossil fuels.
当我们开始使用化石燃料时，地球已经处于温暖的间冰期之一。
The Wandering Earth, a Chinese film, has become one of the most popular films this year.
中国电影《流浪地球》，成为今年最受欢迎的电影之一。
What do you mean no one will know? Heaven knows, Earth knows, you know and I know.
没人会知道是什么意思？天知，地知，你知，我知。
One step in its formation on Earth involves microorganisms; they actually speed up the formation of jarosite dramatically.
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。
Each day I will keep trying to change one thing that I do to protect the earth.
每一天，我都会努力改变我所做的一件事来保护地球。
One problem may be the method of landing back on the Earth.
其中一个问题可能是返回地球的方法。
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