The electron density is much lower at night in the polar cap areas.
夜间进入极盖区后，电子密度则很低。
This year, Shanshan's dad was a pilot on flights over the Polar Cap.
今年，姗姗的爸爸成为了飞两极冰帽的航班上的飞行员。
Zuber and her colleagues also analyzed Mars's much larger northern polar cap.
尤伯和她的同事也分析了火星上要大得多的北部极地冰冠。
Every winter, Mars's polar cap is sheathed in a thin blanket of carbon dioxide.
每到冬季，火星的极冠被一层薄薄的二氧化碳覆盖。
This warm polar cap is believed to contain the highest temperatures on Saturn; the scientists did not give a temperature estimate.
尽管科学家并未做出具体的气温评测，但他们相信这处“温暖”极冠包含着土星上的最高气温。
As often seen through an astronomical telescope eyepiece, the planet's orientation is inverted, with Mars' north polar cap at the bottom.
由于往往是通过天文望远镜的目镜拍摄，火星的方向是颠倒的，行星的北极冠在下面。
Visible also in the above images are the north polar cap of Mars, dark and light soil, clouds, and, in the early images, a global dust storm.
上面的影像中也可以看到火星的北极冰帽，亮暗不同的土壤，云层，以及早期影像中的沙暴。
The pinkish deposits constitute a vast south polar cap believed to contain methane ice, which would have reacted under sunlight to form pink or red compounds.
这些固态氮冰在阳光照射下会产生化学反应，生成粉色或红色的化合物。
He said that further warming could trigger polar ice cap melting.
他说进一步的变暖可能触发极地冰帽融化。
The retreat of the polar ice cap is making the region easier to work in, and there is thought to be lots of oil and gas to tap.
北极冰盖的消融使得在该地区作业较为容易，而且该地区储藏有大量可开发的石油和天然气。
Much has been made about conflicts between Arctic states because of a retreating polar ice cap, which will make many natural resources accessible for the first time.
极地冰冠后退在环北极国家中引发了热议。 随着冰冠消融，下面蕴藏的丰富自然资源将首次浮出水面。
Platteville, Colorado: I'm curious as to weather the polar ice cap melt has increased pressure o the earth's plates?
普莱维尔，科罗拉多州(Platteville Colorado) ：我很好奇极地冰盖的融化会不会增加地球版块的压力。
He is expected to warn ministers in polar regions that the arctic ice cap may totally disappear in as little as five years if nothing is done to curb greenhouse emissions.
他会警告负责极区的部长，如果再不下措施抑制温室气体的排放，则北极的冰帽将在五年内完全消失。
Little has been said in the media about climate change and health - usually what we hear about is polar bears, loss of the ice cap, dying species and flood risks.
媒体总是把注意力放在北极熊、冰盖融化、濒危物种和洪水的危险上，极少提及气候变化对人类健康的影响。
The other bright region in the image is the polar ice cap over the Arctic Ocean.
图中另一块明亮的区域则是北冰洋的极地冰冠。
A nice example is that dreaded polar ice cap.
这儿有一个很好的例子：对于可怕的极地冰帽。
I hadn't nearly come to the end of an earlier wonderful worry of mine about the polar ice cap melting and raising the level of the Atlantic Ocean enough to submerge the entire East Coast.
我还没有来的急从早先的当心两极冰帽融化，大西洋水位要长高并逐步淹没整个东海岸中抽身出来。
Didn't you see the entire North Polar ice cap melting before your eyes?
你们难道没有看到整个北极冰盖在你们眼前融化吗？
The retreat of the polar ice cap is making the region easier to work in, and there is thought to be lots of oil and gas to tap.
北极冰盖的消融使得该区域更容易进入，人们认为那儿蕴藏着丰富的石油和天然气。
Steve and Jack gave a talk about their trek across the Polar ice cap. It was very interesting but it made my hair stand on end just to hear about the dangers they faced.
史蒂夫和杰克讲述了他们在极地冰盖的一段艰苦跋涉，故事津津有味，只是听到他们遇到种种险情时，我吓得很。
Of course, in time the polar ice cap will melt.
当然了，极地的冰帽迟早也会融化。
Since 1979, the size of the summer polar ice cap has shrunk more than 20 percent. (Illustration from NASA)
自1979年以来，夏天极地冰冠缩小的规模达20%以上。（插图由美国航天局提供）
Since 1979, the size of the summer polar ice cap has shrunk more than 20 percent. (Illustration from NASA)
自1979年以来，夏天极地冰冠缩小的规模达20%以上。（插图由美国航天局提供）
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