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polarity
/po`larәtɪ/
(复数: polarities)
n.
The quality, possessed by magnets, electromagnets, etc. of having two opposite poles, or centers of attraction, each of which exerts a force opposite to that of the other, one called positive, the other negative.
极性;两极性(正负两极)。
Presence of two opposite or opposed tendencies.
对立。
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