纪录片《冰冻星球》 第80期 履于薄冰（12）（在线收听）

This daring experiment is measuring how the water flowing

这项大胆的试验旨在探究

under the ice sheet affects the speed with which the glaciers

在冰原底下 水的流动是怎样影响

flow from it, down to the sea.

冰川流向大海的速度

The theory is that the water is acting as a lubricant.

原理是 水起到了润滑的作用

So, the more water there is, the faster the glacier flows.

所以水越多 冰川移动的速度就更快

To the naked eye, glaciers don't appear to move at all.

肉眼看来冰川好像岿然不动

But move, they do.

但它确实在移动

These unique time-lapse images

这些快速回放镜头是近四年来

were captured over the last four years.

捕捉到的画面

Through long observations, we now know

通过长时间的观察 我们得知

that Greenland's ice is flowing down to the sea

格陵兰冰川向大海移动的速度

twice as quickly as it was 20 years ago.

是二十年前的两倍

The speed of the glaciers affects our sea levels

冰川的速度影响着我们的海平面高度

because when they reach the water,

因为当它们遇到了水域

they break apart into icebergs.

它们就破碎成冰山

Occasionally, a real mega-berg is born.

很有可能会形成巨大的冰山