The earthquake is the earth surface, it's like a rapid vibration tsunami, tornado, freeze disaster on earth as often happens, is a kind of natural disasters.

地震就是地球表层的快速振动，它就像海啸、龙卷风、冰冻灾害一样，是地球上经常发生的一种自然灾害。

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The subterranean ocean likely lies nearly 100 miles below the surface of Jupiter's moon, the largest natural satellite in the solar system, giving hope that life beyond Earth is possible.

木卫三是木星在太阳系中最大的卫星，它的地下海洋可能在表面以下近100英里处，这给了我们可能有地外生命的希望。

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The major methods of measuring Q-value by the natural earthquakes are the ones of using the data of free vibration of earth, body wave, surface wave and coda.

利用天然地震波测量Q值的主要方法有：利用地球自由振荡资料、利用体波、利用面波和利用尾波来研究Q值。

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Those fissures and crevices that have trapped natural gas below the Earth's surface are also capable of trapping helium, although typically in small amounts.

CNN: U.S. needs a strategy on helium

For more than six decades, gas companies have been using advanced technologies to hydraulically fracture and safely procure natural gas from up to two miles beneath the surface of the earth.

FORBES: Regulatory Grinches Threaten Obama's Natural Gas Christmas Wish

The burgeoning commercial space sector is also casting its gaze towards Earth's only natural satellite with companies considering everything from mining the lunar surface to building extraterrestrial resorts on it.

CNN: Who owns the moon? It's 'complicated,' say experts