carat

n (abbr 缩写 ct) 1 unit of weight (200 milligrams) for precious stones 克拉（宝石重量单位, 等於200毫克）. 2 (US karat) unit of measurement of the purity of gold (pure gold being 24 carats) 开（黄金纯度单位, 纯金为24开）: a 20-carat gold ring20开的金戒指 * a ring of 20 carats 20开的戒指.

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