钻石的重量单位为克拉 ct
家庭农场曾经是最好的社会单位，克拉特农场就是它的缩影，然而，现在它们已经衰落，让位于生产牲口饲料的大机械化经营了。
The family farm as the prime social unit, of which the Clutters' was the epitome, has declined and given way to huge mechanised operations producing animal feed.
宝石商所用的重量单位，等于2微克或0.0克拉。
A jeweler's unit of weight equal to 2 milligrams or 0.0 carat.
克拉是钻石的重量计量单位。
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