The baby is prattling ( away ) happily in her cot 那幼儿在小床上牙牙自语,快活得很
2.
Fang is hagrid ' s pet and companion 牙牙是海格的宠物，也是伙伴。
3.
Results : with the loss of the alveolar height , the maximum equivalent stress and the principle stress of the upper central incisor periodontium increased 结果：随着牙槽骨高度的降低，上中切牙牙周膜最大等效应力和主应力逐渐增大。
4.
Objective : to study the relationship between angle of tilted abutment and stress distribution of periodontal tissue , and todetermine the angle limit for fixed prosthesis 目的：探讨基牙牙周组织受力与其倾斜角度的关系，找出能够进行固定修复的基牙倾斜角度的极限值。
5.
Periodontal diseases are chronic diseases that invade gums , connective tissues and alveolar bone . it is caused by bacteria accumulated in the oral cavity when little attention is paid to oral hygiene 牙周疾病是一种侵犯牙牙周膜和牙槽骨的慢性破坏性疾病，主要是因为不注意口腔卫生，以致口腔里累积了许多细菌而引起的慢性牙疾病。
6.
At present , there are two kinds of homemade domestic sewing machine s feed dog , single type and double type , when we use single type , it mainly depend the logn teeth on th eleft and presser foo tbottom to fix material . do by presser foot s shape and feed dog , it s more agility and covenient to stitch all kinds of curves and camber lives . therefore , single type have priority to be used to homemade domestic sewing machine ja and jb 目前,国产家用缝纫机的送布牙有单长型和双长型两种型式.当用单长型送布牙时,主要依靠左侧单排的长与压脚板"咬住"面料.通过压脚板的形状和送布牙牙的配合,对各种弯曲或弧状线缝的缝纫,就会操作灵活和方便,因此大多数国产家用缝纫机ja型和jb型优先配用单长送布牙
