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 first soft metal layer and the second soft metal layer are correspondingly plated on the contacts of the positive pole and the negative pole of the dry battery.
第一软金属层和第二软金属层是对应镀在干电池的正电极的触点上及负电极的触点上。
The negative pole of a battery is the part which releases electrons.
电池的负极是释放电子的一端。
The negative pole of a battery is the part which releases electrons.
电池的负极是释放电子的一端。
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