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。

youdao

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。

youdao

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。

youdao

In April 2010 Chestnut was sued by a former investor who alleged fraud and accused Plummer of using investors' money for such things as porcelain teeth veneers, a Lexus SUV for his wife and membership at Dallas' Canyon Creek Country Club.

FORBES: Magazine Article

With the comfort of permanent agricultural settlements came uncomfortable new scourges such as intestinal parasites, bad teeth and the fouling of the water supply.

ECONOMIST: Food in history

Other harsh ceremonies, such as circumcision without anesthetic, teeth sharpening, and physical disfiguration, make what I suggest individual investors endure seem like a tiptoe through the tulips by comparison.

FORBES: Investor Rites of Passage - Part 1