相对较短的四肢、用于抓握的手部、对生木质、铲形前齿、方形臼齿和带有指甲指头而不是爪子，这些都是艾达化石的典型特征。
Her features include relatively short limbs, grasping hands, opposable thumbs, shovel-like front teeth, square molars, and digits with nails rather than claws.
这块有着4700万年历史的化石之所以被称为是人与猿之间缺失的环节，是因为它的大拇指与其他手指相对，并且具有了手指甲。
The 47 million-year-old fossil is the missing link between man and ape as the creature had opposable thumbs, and fingernails.
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