However, the National Autistic Society in the UK says that the exact causes of autism were unknown.

然而，英国国家自闭症学会说自闭症的确切病因还不为人知。

youdao

However, the National Autistic Society in the UK says that the exact causes of autism were unknown.

然而，英国国家自闭症学会说自闭症的确切病因还不为人知。

youdao