顺便说一下，如果你好奇为什么在判断牙齿年龄方面、外消旋化会比碳14定义的时钟精度差之甚多，那么部分原因与温度相关。
By the way, if you're curious about why racemization is so much less accurate a clock than C-14 for dating a tooth's age, part of the explanation has to do with temperature.
无论年龄大小，良好的口腔卫生和定期的牙齿保健都非常重要。
Good oral hygiene and regular dental care are important, whatever your age.
通常说来，年龄是通过生理特征确定的，譬如牙齿或骨骼。
Usually, age is determined by physical characteristics, such as teeth or bones.
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