The findings, according to the researchers, support the idea that dependency on cigarettes is itself a chronicsource of stress.
根据研究者们的发现，依靠抽烟来缓解压力本身就是长期压力的一个根源。
2
The offspring of the former group were more likely to have chronic diseases upon reaching middle age than their peers of the latter group [source: Kolata].
与同龄人或后一组人相比，前一组的后代在人到中年后更容易得慢性病。
3
The fact that we don't feel efficient — that we feel, as Carr puts it, like "chronic scatterbrains" — is in a sense the source of the new efficiencies;