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汉语拼音：qián jiù chǐ

1.位置在犬齿的后面﹑臼齿的前面的牙齿。人类的前臼齿上下颌各四个﹐齿冠的咀嚼面上有两个或三个突起﹐适于磨碎食物。

1. 位置在犬齿的后面、臼齿的前面的牙齿。人类的前臼齿上下颌各四个，齿冠的咀嚼面上有两个或三个突起，适于磨碎食物。

• Absence of more than two first premolars or absence of a first and a second premolar.

  缺少超过两个第一前臼齿或者一个第一和一个第二前臼齿。

• "It was clear that while the premolar was broadly humanlike, it wasn't from a modern human, " Brown recollects .

  布朗回忆道：「我看得很清楚，虽然那颗前臼齿大体而言像人牙，可绝不是现代人的牙齿。」

• Adults have eight premolar teeth, next to each canine tooth in the upper and lower jaw.

  成人长有八颗前臼齿，分别位于上下颚犬齿的后端。

• Absence of a third or a fourth premolar or of one molar.

  缺少一个第三或者一个第四前臼齿或者一个臼齿。

• But Longgupo also yielded a mystery jaw fragment, including the fourth pre molar and the first molar .

  但龙骨坡还发现了一件神秘的下颌残片，包括第四前臼齿和第一臼齿。