The longer line represents the positive pole .
较长的线代表正极。
Drag onto the page. the longer line represents the positive pole.
拖到绘图页上。较长的线代表正极。
The action of the negative pole of a magnetic needle is just as real as the action of the positive pole.
一根磁针的磁极作用，无论正负都是一样的真实。
The action of the negative pole of a magnetic needle is just as real as the action of the positive pole.
一根磁针的磁极作用，无论正负都是一样的真实。
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