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。

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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。

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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。

《柯林斯英汉双解大词典》

The atmosphere is about twenty-percent oxygen and eighty percent nitrogen from Earth's surface to where space begins at one-hundred-twenty kilometers up.

VOA: special.2011.04.06

But the servant who had been given only one talent hid the talent in the earth so as -- perfectly understandably ] - so as not to risk the only talent that he had been given.

但只得到一枚金币的仆人,把他的金币藏了起来--这可以理解,-为了不使这个他仅有的,金币丢了。

耶鲁公开课 - 弥尔顿课程节选

The one theory made some investigations of earth spores, hoping to find-- what do you call that stuff that floats around and makes you sneeze? Pollen.

有种学说对于,土地孢子进行了调查,期待发现,通过植物种子的变化推定气候状况的方法

耶鲁公开课 - 古希腊历史简介课程节选

That also means that Mount Sharp was formed in a different way than how mountains are created on Earth -- no one knows how.

CNN: Rover Curiosity near Mars landing

It is the Goliath of the Web, with search, e-mail, e-commerce, instant messaging, classified ads, and even its own virtual planet with Google Earth -- all adding up to one mega-market cap.

CNN: 15 years of the World Wide Web

Now only visible with the largest ground-based telescopes or from space, 1999 RQ36 currently lies about one earth-sun distance away.

FORBES: New Observations Signal NASA Mission's Target Asteroid Is Sample-Friendly Rubble Pile