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Hummel has worked out the theory for the twoand-three-layer cases using the method of images.
哈梅尔用电象法建立了两层和三层条件的理论.
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Back in 1970, Hummel caused shockwaves by sending a few star players out in its white footwear;
回溯至1970年，Hummel（丹麦运动品牌）因为赞助给个别球员白色的战靴而引起哗然大波。
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