That like charges repel but opposite charges attract is one of the fundamental law of electricity.

同性电荷相斥，异性电荷相吸，是电学的一个基本规律。

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The upper and lower rings have opposite charges, which allow the motor to contract and release, alternately tugging at the DNA like a ring of hands pulling on a rope.

高环和低环具有相反的电荷，这样的特性可以使其像拉绳子的两只手一样交替地拉住DNA。

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They are exactly alike except that they have opposite electrical charges.

除了电荷相反外，它们完全一样。

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In electrophoretic displays, tiny white and black pigment particles are given opposite electrical charges and encapsulated in microcapsules of about the diameter of a human hair.

ECONOMIST: REPORTS

And since their charges are opposite, the interaction deflects the two sorts of particles in different directions.

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