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一、重点讲解1．磁体物体能够吸引铁、钴、镍等物质的性质叫做磁性．具有磁性的物体叫做磁体,磁体上磁性最强的部分叫做磁极．任何一个磁体,无论其形状、大小如何,在它的两端都存在一对不可分割的磁极,分别称为北(N)极和南(S)极．自然界中不存在只有单个磁极或多于两个磁极的磁体,磁体上的磁极总是成对出现的．如果将一磁体一分为二,则分开后的每个磁体将仍有两个磁极;如将两个磁体相互吸引,合二为一,整体仍为两个磁极,而不是四个磁极．
First, focus on explaining Magnets attract iron, cobalt, nickel and other substances called magnetic. An object that has magnetism is called a magnet. The most magnetic part of a magnet is called a magnetic pole. Any magnet, regardless of its shape or size, has a pair of indivisible magnetic poles at its two ends, called North (N) and South (S), respectively. There is no magnet with only a single magnetic pole or more than two magnetic poles in nature. The magnetic poles on the magnet always appear in pairs. If a magnet is divided into two, then each separated magnet will still have two magnetic poles; if two magnets are attracted to each other, the two will be one, the whole still two magnetic poles, rather than four magnetic poles.