north-polar

基本解释

In this paper we discuss the problem of taking time from Beijing to Detroit flying over the north polar regions.
讨论了飞机从北京到底特律沿不同航线飞行的时间问题 .
The scal of the North Polar Ice Cap in the month of September is only half the scal it am a mere 50 seasons ago.
北极冰盖在4月份的大小，只相当于50年前的一半。
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.
在上面的影像中还可以看到火星的北极冰帽，色彩深浅不一的土壤，云层，以及在早期相片中的出现的全球性沙尘暴。
In this example showing the north polar region, a very recognizable Big Dipper, part of the modern constellation Ursa Major, lies along the bottom of the chart.
这幅图描绘的是北天极区域，清晰可辨的北斗七星位于这张星图的底部，现在它是大熊座的一部分。
Two explanations are given from the angle of mathematics about "It saves nearly 4 hours across the North Polar Regions to North America form Beijing to Detroit" under the following two cases: (1) The earth is a globe; (2) The earth is an ellipsoid.
对“飞越北极 ;北京至底特律的飞行时间可节省 4小时”问题 ;从数学的角度分别给出了 :(1)地球是球体 ;(2 )地球是椭球体两种情况下的合理解释 .