The important fact is that the two poles of the magnet work in opposite ways.
重要的事实是，磁体两极的运行方式完全相反。
If you cannot have one without the other, it is like the north and south poles of a magnet.
这种统一是指你不能拥有一个而不拥有另一个，它就像一块磁铁的南北两极。你不能拥有一个单极磁铁。
The Earth's magnetic field is roughly like that of a bar magnet, with two opposite poles.
地球的磁场大致就像是一块拥有两个磁极的磁铁。
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