以下为句子列表：
英文: A tooth with a single cusp. Cuspids have the longest root of any tooth. Also known as a Canine.
中文: 只有一个牙尖的牙齿.任何一个尖牙都有一个较长的牙根.也称为犬齿.
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英文: The teeth located between the cuspids and the molars, having either two or three cusps. The bicuspids are numbered 4, 5, 12, 13,20,21,28 &29. Also known as Premolars.
中文: 位于尖牙和磨牙(臼齿)之间的牙,所有双尖牙都有两个或三个牙尖.双尖牙被编号为4,5,12,13,20,21,28和29.也被称为前磨牙(臼齿).
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