您要查找的是不是：
- north polar sequence 北极星序
- 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 .
- The smooth Snow Queen feature is strongly suspected to be ice originally just under the soil, uncovered by the thruster rockets as Phoenix set down on the north polar plains of Mars. 冰后光滑的特征很明显是在土壤下形成的冰块，当凤凰号飞船降落到火星北极平原时由火箭推进器揭露了其面纱。
- This device requires the presence of both south and north polarity magnetic fields for operation. 操作该器件需要南极和北极磁场同时存在。
- The A3230 Hall-effect bipolar switch turns on in a south polarity magnetic field of sufficient strength and switches off in a north polarity magnetic field of sufficient strength. 3230的霍尔效应双极开关在南方极性磁场足够的强度及开关过北极性磁场足够的强度。
- He flew to Europe via the North Pole. 他经由北极飞到欧洲。
- In the presence of a south polarity field of sufficient strength, the device output latches on, and only switches off when a north polarity field of sufficient strength is present. 如果南极磁场的强度足够大,器件输出会开锁;而如果北极磁场的强度足够大,器件输出就会关闭。
- And you come from North Dakota! I want to know. 原来你是北达科他州来的！真想不到！
- We have found oil under the North Sea. 我们在北海发现了石油。
- The north wind set them shivering. 北风吹得他们浑身打颤。
- The pitiless north wind blew for weeks. 凛冽的北风一连刮了几个星期。
- The wasteland of the north is scarcely populated. 北方的大荒原地广人稀。
- These stars appear to move around the North Star. 这些星星似乎环绕着北极星转。
- polar sequence 近极星序
- A cold front is moving in from the north. 一股冷锋正从北方向这里移动。
- Living in the far North had inured him to cold. 居于极北部使他习惯于寒冷。
