Overall, C-14 analyses gave superior age-at-birth dates, but only for people whose teeth erupted after the bomb blasts, meaning individuals about 60 and younger.

总体而言，碳14分析技术提供了卓越的出生年龄数据，但仅限于核弹爆炸后长牙的人们，也就是60岁左右及更年轻的个体。

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This process can also be performed in a c-section birth.

破腹产也可以进行这个过程。

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And if a natural birth would pose a health risk for mother or baby, a c-section would be allowed.

如果顺产会威胁母婴健康，允许进行剖腹产。

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Experts say babies are unprepared for birth when a doctor performs a C-section.

VOA: special.2009.11.24

The team said birth by C-section might affect bacteria in the gut, which in turn affects the way food is digested.

BBC: C-section 'may double risk of childhood obesity'

Many women who have had cesarean sections inquire about the possibility of attempting a vaginal birth after C-section (VBAC), sometimes also called trial of labor after C-section (TOLAC).

CNN: Is it OK to have a VBAC?

C. gave birth to the first three philosophers of nature.

WSJ: 'Aladdin's Lamp'