He is a teenager, with the rebellions and feistiness characteristic of that age, but I like to think that, on balance, Henry would do it again if he had to.
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。
3
Bad smells are not just a matter of poor hygiene. Illness and old age both bring characteristic odours of their own, and neither state makes people more attractive.