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。
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。
One day, a UFO come to the earth.
有一天，一个外星飞碟来到了地球。
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。
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。
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。
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。
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。
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。
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。
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。
The lack of one basketful of earth spoils the entire effort to build a nine-ren mountain.
为山九仞，功亏一篑。
There is no path to Heaven one can go, no door to Earth that one can enter.
上天无路，入地无门。
Throughout history, only one Earth has been known to exist in the universe. Soon there may be another.
纵观历史，人们仅知道宇宙中只有一个地球存在，然而，用不了多不久，可能会出现一个新的，接着，又是一个。
This planet, possibly an ill-fated world, whips around its star in less than one Earth day.
这颗行星，可能是一颗走恶运的星球，绕着它的母星快速公转快于一个地球日。
Because there is only one Earth.
因为我们只有一个地球。
人类只有一个地球！
There is a very simple reason: We live on one earth, and this is the only place we can live right now.
原因很简单：我们生活地球上，而且这是目前我们唯一可以居住的地方。
We only have one earth, so we have to try our best to protect it.
我们只有一个地球，所以我们必须尽最大的努力保护它。
Earth is the only human to survive, we have only one Earth.
地球是人类唯一能够生存的地方，我们只有一个地球。
In all, we have only one earth, we should do our best to protect it, or we will regret.
总之，我们只有一个地球，我们应该尽最大的努力去保护它，否则我们都会后悔的。
We only have one earth, but this unique earth is not simple.
我们只有一个地球，但这唯一的地球并不是那么简单。
We only have one earth, but this unique earth is not simple.
我们只有一个地球，但这唯一的地球并不是那么简单。
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