Usually, age is determined by physical characteristics, such as teeth or bones.
通常说来，年龄是通过生理特征确定的，譬如牙齿或骨骼。
It had feathers and other traits of living birds but also vestiges of a reptilian past, such as teeth in its mouth, claws on its wings, and a long, bony tail.
始祖鸟拥有羽毛，它身上既有现代鸟类的特征，也有远古爬行动物的痕迹，例如口中有牙齿，翅膀上有爪子，还有一条硕长的骨质尾巴。
Failure mode of tooth surface is varied such as teeth surface pitting, teeth wear, teeth bonding and teeth plastic deformations and so on.
齿面常见的失效形式有齿面点蚀、齿面磨损、齿面胶合和齿面塑性变形等。
First, the defensive posture, where the body is fluffed up to appear larger or weapons such as teeth and claws are flashed.
首先是防御姿态，如果身体上有羽毛的话就竖起来，或是亮出牙齿和爪子等武器。
First, the defensive posture, where the body is fluffed up to appear larger or weapons such as teeth and claws are flashed.
首先是防御姿态，如果身体上有羽毛的话就竖起来，或是亮出牙齿和爪子等武器。
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