科学家们还拿捏不准该病的病因，虽然可以归咎于某种基因，压力和感染的共同影响。
Scientists do not understand exactly what causes the ailment, though a combination of genetics, stress and infection may be to blame.
虽然基因遗传在是自闭症的一个病因，但是这并不是一个简单的遗传过程。
While genetics are thought to play a part in autism, the condition is not inherited in a straightforward way.
这样的小毛病迄今为止还没有确切的病因——虽然如此，它还是有一定规律可循：症状往往持续时间相当短。
The ailment has no known cause — though there are a few theories — and usually lasts for a fairly short period of time.
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