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。

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We are used to that, earth has a natural motion of downwards.

过去我们常常认为土的自然规律就是向下运动。

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HOW long will it be before everyone on Earth has a mobile phone?

地球人都用上电话还需要多久？

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Mister Gore has been a strong activist for limiting Earth's temperatures.

VOA: special.2010.04.27

Would anybody volunteer to say a sentence, non obscene, non derogatory, that has never been spoken before on earth, ever?

有没有人自愿说个句子,不能是下流的,不敬的,得是世上从未有人说过的句子

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But gravity has a remarkable property that the pull of the Earth is itself proportional to the inertia of the object.

重力有一个显著特征,即地球的引力,与物体的质量成比例

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By this standard, the planet Earth has a value of one.

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For why on earth has a local council bureaucracy had to issue a press release about a 9 year old pupil not being allowed to photograph her lunch?

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Unfortunately, not every corner on earth has a power outlet.

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