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。
Unfortunately, the fourth premolar in the upper jaw is quite large and looks like the first molar in the lower jaw; it is known as a carnassial tooth.
不幸的是，上颚的第四颗前臼齿很大，看起来就象是下颚的第一颗臼齿，这颗前臼齿也被称作叫裂齿。
Unfortunately, the fourth premolar in the upper jaw is quite large and looks like the first molar in the lower jaw; it is known as a carnassial tooth.
不幸的是，上颚的第四颗前臼齿很大，看起来就象是下颚的第一颗臼齿，这颗前臼齿也被称作叫裂齿。
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