In our society, we know that Earth has only one moon.
在我们的社会中，我们知道，地球只有一个月亮。
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。
We only have one earth, so we need to take care of her.
我们只有一个地球，所以我们必须要照顾好她。
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。
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。
From Earth, we can only see one side of the moon.
从地球上，我们只能看到月球的一面。
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。
It went across one fourth of the earth.
它跨越了地球的四分之一。
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。
Mount Etna is one of the most active volcanoes on Earth.
埃特纳火山是地球上最活跃的火山之一。
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。
One out of nine people on Earth does not get enough food.
地球上每九个人中就有一个人得不到足够的食物。
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。
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