To feed the seven billion people on Earth, most farmers today are growing only species of plants and farming only species of animals that are easy to produce in large numbers.

为了养活地球上70亿人，今天的大多数农民只种植或养殖易于大量生产的植物和动物。

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Understanding this cycle is important, not only because it sustains life on Earth, but also because it is bound up with the rate of global warming.

理解这种循环很重要，不仅因为碳循环维持地球上的生命，而且因为它对于全球变暖的速度有密切关系。

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If we don't look after our earth carefully, the day will come when flowers will only be able to grow on the moon.

如果我们不仔细照顾我们的地球，总有一天，花将只能在月球上生长。

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The Everglades is the only place on Earth where fresh water alligators and saltwater crocodiles live in the same area.

VOA: special.2009.06.30

It turns out the U.S. and Jamaica are the only two places on Earth now that use the Fahrenheit scale.

事实上现在地球上,只有美国和牙买加这两个国家,还在使用华氏温标。

麻省理工公开课 - 热力学与动力学课程节选

Poets are not only due the highest respect imaginable here on earth, Milton's explaining to his dad.

诗人不单止在世上应该得到可能的最高尊重，弥尔顿跟他父亲解释到。

耶鲁公开课 - 弥尔顿课程节选

We are the only democracy, the only advanced democracy on Earth, the only wealthy nation that allows such hardship for millions of its people.

CNN: Obama offers health care details in speech to Congress

It is the only place on earth where, under the anti-ballistic missile treaty, the United States was allowed to test its strategic interceptor missiles, a key component of President Bush's missile-defence programme, sometimes known as Star Wars II.

ECONOMIST: A new agreement for America's missile range

With the demise of the Soviet Union, Mr Terrill says, China is now the only empire left on earth, if the term empire is defined as a multicultural country held together essentially by force.

ECONOMIST: China and America