The method exploits a characteristic of immune cells carried in the blood known as t cells. The approach enables scientists to estimate a person's age, give or take nine years either side.

在这种方法中，科学家通过运用血液中携带的免疫T细胞的特点，可以估计一个人的年龄，而误差为九岁左右。

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It wasn't until nine years later that he and his religious superiors agreed that he might be well-suited for a chaplain position.

CNN: Specials

Hasn't happened in nine years.

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Perhaps more importantly, the Bruins overcame a frenzied crowd here that hasn't seen playoff hockey in nine years.

WSJ: Bruins' Krejci Shines in Playoffs Win Against Maple Leafs