It has been suggested that birds can sense the magnetic lines of force stretching from the north to south magnetic poles of the earth, and so direct themselves.

有人认为，鸟类能觉察得出地球自北向南磁极的磁力线，因而能为自己导向。

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Well, with a lot of money, you can cut even the atom into to subatomic particles: protons, neutrons and electrons, but even these little magnets still always have one North and South magnetic pole.

好吧，如果你有很多钱，你甚至可以把原子分成一些亚原子粒子：质子、中子和电子，但即使是这些小磁体，也还是有南北磁极。

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The magnetic termite Amitermes meridionalis of Australia uses Earth's magnetic field to build mounds elongated in anorth-south direction.

生活在澳大利亚的磁石白蚁（ Amitermes meridionalis）利用地球磁场建造南北走向的白蚁丘。

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You can take something that's magnetic with a north-south 1 magnetization and just say arbitrarily, this will represent one.

你只需要一个北南极的磁性物体,任意指定，比方说代表。

哈佛公开课 - 计算机科学课程节选

The sun's magnetic north and south poles were in their respective northern and southern hemisphere several months ago.

CNN: Sun flips magnetic field

Furthermore, scientists are keen to find out if the Earth's magnetic poles are about to "flip" - with magnetic North becoming South, and vice versa.

BBC: Planet Earth

In 1998, Mr Hempleman-Adams became the first person to complete the Adventurers' Grand Slam after climbing the highest peaks in seven continents and reaching the geographic and magnetic North and South Poles.

BBC: World explorer Hempleman-Adams: 'I've been lucky'