1、 14,21 and 28 are all multiples of 7.
14、21和28都是7的倍数。
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2、 There are superstitions attached to numbers; even those ancient Greeks believed that all numbers and their multiples had some mystical significance.
迷信与数字有关；甚至那些古希腊人也相信所有的数字及其倍数都具有神秘的意义。
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