Such ice cores trap gases, bits of dust, and other chemicals that were present in the snow that fell over Greenland for thousands of years and then became compressed into ice.
这些冰芯将气体、尘埃和其他化学物质封存在格陵兰岛数千年来的积雪中，然后被压缩成冰。
A tourist trap par excellence, this drugstore in South Dakota is famous for its roadside billboards that start advertising 'free ice water' several states away but it's a surprisingly worthy stop.
南达科他州药物墙：一个卓越的旅游陷阱，南达科他州的这个药店因路边的广告牌而出名，它开始在几个州宣传免费冰水。但是它的确令人惊讶的值得你停下来。
That produced a greenhouse effect which, in turn, melted seabed structures known as methane clathrates, which trap that gas in ice.
产生了温室效应，反过来融化了海底甲烷包合物结构，将气体锁在冰中。
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