Although we had some knowledge of the etiology, gene location, diagnosis and therapy of AD, there are still a lot of unknown field about AD need to be done.
虽然目前有关AD的发病机制、基因定位以及诊断和治疗方面已经取得了很多成就，但仍有许多未知领域有待于进一步探索。
Although the definite etiology and pathogenesis are not very clear up to now, many studies show that the immunological factors play a key role in the demyelinating disease of CNS.
虽然其确切的病因和发病机理尚不十分清楚，但许多研究表明免疫学因素在中枢神经系统炎性脱髓鞘病中起着关键性的作用。
Although several conditions have been linked to stillbirth, it is difficult to define the precise etiology in many cases.
虽然许多种情况与死产有关，在许多病例中很难定义准确的病因。
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