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.

他是个十几岁的人了，带着这个年龄段特有叛逆和暴脾气，但是，我倒愿意这样认为，总的来说，如果有必要，亨利会再做一次。

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。

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.

难闻的味道不光是不卫生的问题，疾病和衰老都具有各自的特色气味；不过上面的这两种情况都不能增加人的吸引力，但是香水却可以粉饰上述问题。