This has generally been thought of as a symptom-and as support for the infection theory of the syndrome. But perhaps it is the cause.

人们普遍这种症状支持了慢性疲劳综合征的感染理论，可是，它也可能就是病因。

youdao

And we might as well try to have a theory of what's going on when that happens, so that we can understand the conditions of infection.

事实上，我们所经历的大多数的观念都不是新鲜的，而是传染性的复制。我们最好能有一套理论，来解释这样的观念传播的过程，好使得我们可以更好的理解具体的情况。

youdao

Theory Background: Acute viral upper respiratory infection is a most common clinic infective disease, and about 70%-80% of it is caused by virus.

理论背景急性上呼吸道感染是临床最常见的一种感染性疾病，约有70% - 80%由病毒引起。

youdao

This has generally been thought of as a symptom and as support for the infection theory of the syndrome.

ECONOMIST: Fatigue: Killing time | The

Professor Jillian Birch, director of the Cancer Research UK's Paediatric and Familial Cancer Research Group in Manchester, said the results seemed to back the theory that some childhood brain tumours were linked to infection.

BBC: Cancer linked to measles and flu