前臼齿

In cultured primordia, molar and incisor tooth germs can easily be distinguished by their appearance and their gene activity, although other shapes found in the human mouth, such as premolars and canines, are more difficult.

在组织培养的牙齿原基里头，可以从外观和基因的活性，轻易分辨出臼齿与门齿的牙胚，不过，人类口腔里的其他牙齿，像是前臼齿与犬齿，就比较难以区分。

Carnassial : Last premolar of upper jaw, first molar of lower jaw.

裂齿 ：上颚最后的一只前臼齿，下颚最前的一只臼齿。

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。

Mental and mandibular foramen of 250 Chinese mandibles were studied.

观察250个中国人颏孔及下颌孔的位置所得到的结果如下：1.78.4％的颏孔是在第2前臼齿的下方。2。

That excavation yielded stone tools, evidence of fire use by early man, burnt seeds of hackberry trees and bones, and fossils of mammals such as jackal and deer.

获得石器和古人类用火的证据灰烬、烧石及烧过的朴树籽以及豹和鹿的化石；1937年又在此发掘，获得古人类前臼齿1枚和动物化石40多种，包括猕猴、鼢鼠、熊、三门马、李氏野猪、赤鹿、葛氏斑鹿等。

That excavation yielded lithic tools, evidence of fire use by early man, burnt seeds of hackberry trees and bones, and fossils of mammals such as jackal and deer.

获得石器和古人类用火的证据灰烬、烧石及烧过的朴树籽以及豹和鹿的化石；1973年又在此发掘，获得古人类前臼齿1枚和动物化石40多种，包括猕猴、鼢鼠、熊、三门马、李氏野猪、赤鹿、葛氏斑鹿等。

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。

Premolar is short, simple structure in front of three, single-pointed.

前臼齿短，前面的三个构造简单，单尖。

Absence of one incisor or one canine, a third premolar or a fourth premolar or of one molar.

缺一个门齿或犬齿，第三前臼齿或第四前臼齿或一个臼齿。

From each side, in the upper jaw,(1) is the canine,(3) the small premolars,(1) the large premolar and (2) the smaller molars.

从两边看，在上颚处，各有（1）犬齿，（3）颗小前臼齿，（1）颗大前臼齿和（2）颗小臼齿。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。