Only dogs registered in the national stud book have a record of their parentage and genetic traits.

只有在国家畜类良种登记册上登记过的狗才有它们的亲子关系和遗传特质的记录。

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After winning a surprise gold medal in the 110m hurdles in Athens four years ago, Liu morphed from amiable jock to national stud.

自从四年前刘翔在雅典爆冷夺取110米栏金牌后，他从一名普通的运动员变为全国偶像。

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Mr. Savino reviewed the AKC stud book records they track the ancestry of every dog and bitch that's been party to a registered blessed event since the late 19th century then checked earlier stud books from the National Kennel Club (available only on microfilm) as well as a bound catalog from the 1878 Westminster competition.

WSJ: A Library With a Pedigree | American Kennel Club Research Library | By Joanne Kaufman