纪录片《冰冻星球》 第73期 履于薄冰（5）

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The Arctic Ocean is of huge military importance,

北冰洋有重要的军事意义

as it's the shortest route between North America and Russia.

因为这里是北美和俄罗斯之间最短的通道

Since the late 1950s,

自上世纪五十年代末起

British, US and Russian submarines

英国 美国和俄罗斯的潜艇

have been patrolling the Arctic Ocean.

就在北冰洋巡逻

But as well as looking out for enemy activity,

他们在探查敌军的动向的同时

they've also been measuring the thickness of the ice,

也在测量冰面的厚度

critical when looking for a place to surface.

因为这关系到他们在何处浮出水面

When scientists got permission

当科学家获得准许

to look at the submarine crew's records,

查看潜艇船员的记录时

they discovered that the ice has been thinning fast.

他们发现冰面在急速变薄

In fact, it's nearly halved¹ in thickness since 1980.

事实上 从1980年起已减少近一半

Across most of the Arctic Ocean,

北冰洋大部分的冰面

there are now just a couple of metres of ice.

现在只有几米厚了

It's so thin that it could

冰面实在太薄

melt away almost entirely² in the summertime,

到了盛夏时节很可能会全部融化

and that includes the ice at the North Pole.

北极的冰也难以幸免

If current trends continue, then there will be

如果持续下去 在未来几十年里

open ocean here by summer's end,

到了夏末

some time within the next few decades.

这里就完全变成海洋

So, the days of the Arctic Ocean being covered

北冰洋被冰层覆盖的岁月

by a continuous sheet of ice seem to have passed.

似乎已一去不返

Whether or not that's a good or bad thing, of course,

当然 这究竟是好是坏

depends on your point of view.

每个人的观点不同

1 halved   

v.把…分成两半( halve的过去式和过去分词 )；把…减半；对分；平摊

参考例句：

• The shares have halved in value . 股价已经跌了一半。
• Overall operating profits halved to $24 million. 总的营业利润减少了一半，降至2，400 万元。 来自《简明英汉词典》

2 entirely   

ad.全部地，完整地；完全地，彻底地

参考例句：

• The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
• His life was entirely given up to the educational work. 他的一生统统献给了教育工作。