carat
noun [ C ] uk/ˈkær.ət/ us/ˈker.ət/ (written abbreviation ct.)
克拉(宝石的重量单位)
a unit for measuring the weight of jewels (= precious stones)
UK (US karat)开(黄金的纯度单位)
a unit for measuring how pure gold is
24-carat gold is the purest. 24开的黄金是最纯的。