The Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.

奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。

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Thee Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.

奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。

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I had never considered this theory before, that ice was a riddle whose origin demanded to be solved, a potential form of drink pollution.

我之前从没想到还会有这样的理论—冰居然被看作一种来历不明的会对饮料造成潜在污染的东西！

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The Norwegians send teams out on to the floating ice to drill holes into it and extract cores to determine the ice's origin.

BBC: Arctic ice melting at 'amazing' speed, scientists find

These data will provide invaluable information about Antarctic atmospheric dynamics, of the origin of water vapour over the oceans and how it is ultimately deposited as snow on the surface of the ice sheet.

BBC: Viewpoint: The last great polar challenge