1. The mottled, horny, translucent, brownish covering of the carapace of certain tortoises or turtles, especially the hawksbill, used to make combs, jewelry, and other articles. 
   龟甲，玳瑁某些乌龟或甲鱼肉体上覆盖着的有花纹，角质、透明的，褐色的甲壳特别是玳瑁龟的甲壳，通常用来制作梳子，珠宝和其它工艺品
2. small freshwater crustaceans with a shield-shaped carapace. 
   小型淡水甲壳动物，长有盾牌状甲壳。
3. small aquatic crustaceans lacking a carapace: fairy shrimps; brine shrimps. 
   无甲壳的小型甲壳动物；仙虾；卤虾。
4. wide ranging marine turtle with flexible leathery carapace; largest living turtle. 
   广泛分布的海龟，甲壳象柔韧的皮革；最大的活龟。
5. Any of various minute, chiefly freshwater crustaceans of the subclass Ostracoda, having a bivalve carapace. 
   介形亚纲动物属介形亚纲的任一种体小的、主要生活于淡水中的甲壳纲动物，长有一对硬壳

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