thoroughbred [ˈθʌrəbred]

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n.优良种(动物，尤指马的)；adj. 优良的

(a horse ) with parents which are of the same breed and have good qualities

The dog is a real thoroughbred.这条狗是真正的纯种狗。
She was riding a thoroughbred horse.她骑着一匹纯种马。