He was about half way across the river when the tree trunk moved suddenly, John fell from it onto the ice.

VOA: special.2010.06.26

Some children bring all the tools they are on and one of the boys share he wants to bring a ice cream machine.

一些孩子画上了他们喜欢的所有工具,其中一个男孩,告诉大家他想带一台冰激凌机。

麻省理工公开课 - 媒体、教育、市场课程节选

It made the ice thin. If he stepped there, he might break through the ice into a pool of water.

VOA: special.2010.05.01

He says changes to the ice cover also affect Arctic wildlife and people who depend on the local environment.

VOA: special.2009.05.05

But he says there is no reason to think that the ice levels will return to the levels of thirty years ago.

VOA: special.2009.10.27

But he was too tired to search for a place where the ice had melted.

VOA: special.2010.06.26

He poked through the ice for hours, looking for his furs,traps and gun.

VOA: special.2010.06.26

As he walked, he looked carefully at the ice in front of him.

VOA: special.2010.05.01

He saw that an underground spring flowed under the ice at that spot.

VOA: special.2010.05.01

The ice over the river had melted when he reached it.

VOA: special.2010.06.26

The American said after Saturday's silver medal that he knows his younger teammates will build on his success on the ice.

VOA: standard.2010.02.28

He says a warmer Arctic and thinner sea ice changes the balance between the normally cold Arctic and warmer areas.

VOA: special.2009.05.05

He warns that the Arctic Ocean could be free of ice during future Northern Hemisphere summers.

VOA: special.2009.10.27

Pure white snow and ice covered the Earth for as far as he could see.

VOA: special.2010.05.01

He began to walk on the snow-covered ice.

VOA: special.2010.05.01

He says this piece of work is more about the melting ice of the Arctic than polar bears.

VOA: standard.2009.12.13