角蛋白一种不溶解的较硬的蛋白物质，是头发、指甲、角和蹄的主要结构成分 A tough, insoluble protein substance that is the chief structural constituent of hair, nails, horns, and hoofs.
最后她终于想到了写字，用一只蹄子把她的名字－－很短的一个名字－－划在沙地上。 At length she bethought herself of writing, and inscribed her name-it was a short one-with her hoof on the sand.
紧跟在他身後出现了一个带角的分趾蹄动物 Close behind him appear an animal with horn and cleave hooves.
这匹马呼哧呼哧地喘着气，不耐烦地跺着蹄子。 The horse snorted and stamped its hoof impatiently.