1.
North magnetic poles repel .
磁北极与磁北极互相排斥.
2.
The magnetic North and South poles have shifted before in the course of the planet's history- one result being the last Ice Age.
在地球的历史进程中地磁北极和磁南极已经转换过-一种结果就是最后的冰河时期。
3.
true north (north according to the earth's axis,not magnetic north)
真北（以地轴北极为正北的,非磁极之北）.
4.
Around a bar magnet, for example, the lines of force point from the north pole to the south.
例如，在磁铁棒周围的磁力线从北极指向南极。
5.
The North magnetic pole is located to the south in Northern Canada;
北磁极坐落于北部加拿大以南；
6.
A distinction between positive(north)and negative(south)magnetic poles of an electromagnet or permanent magnet.
一种电磁体或永磁体的南北磁极之间的区别。
7.
It is called the north pole of the magnet, which is usually marked N.
这就叫磁体的北极，通常用n表示。
8.
Every planet that has a magnetic field has a northern point and a southern point.
每个有磁场的行星都有北极点和南极点。
9.
( Compass needles point to the earth's north geographic pole because the dipole's south magnetic pole lies near it.
（北针的磁针之所以会指向地球的地理北极，就是因为上述偶极的磁南极正好在那附近。
10.
Occasionally, however, the dipole part of the field reverses, causing the locations of the north and south magnetic poles to switch.
不过，有时候磁场的偶极部分会倒转，导致了北磁极和南磁极的位置转换。
11.
Magnetic minerals trapped inside ancient rocks have recorded hundreds of these so-called polarity reversals in the past500 million years.
在地磁反转后，指北针的指针会指向南极，而不再是冰冻的北极。
12.
CHANGE CHARACTERISTICS OF MAGNETIC STORM IN ANTARCTIC ZHONGSHAN STATION AND BEIJING MING TOMBS MAGNETIC OBSERVATORY CENTER OF CHINA ON MARCH 24,1991
南极中山站与北京地磁中心台1991年3月24日磁暴的变化特征
13.
It has been suggested that birds can sense the magnetic lines of force stretching from the north to the south magnetic poles of the earth .
有人提出：鸟能感觉到从地球北极通向南极的磁力线。
14.
The northern Arctic regions are ice-covered sea, almost completely surrounded by land. The pole itself is in deep water.
北极的北部极地是冰封的海域，它几乎完全为陆地所包围，磁极本身位于深海。
15.
The North magnetic pole seems to be moving northward at an average rate of 1 0 kilometers per year.
北磁极似乎正在以平均每年10千米的速度向北移动。
16.
aurora Polaris
【地物】极光, 北极光
17.
Paleomagnetic poles of mafic dyke swarms from the North China craton and their relevance to the reconstruction of the supercontinent Columbia.
华北基性岩墙群的古地磁极及其哥伦比亚超大陆重建意义
18.
Polar bears live in the North Pole.
北极熊居住在北极。