传统的研究当中很多都是要么泛泛而谈，要么缺乏理论基础。

Much of the traditional research on it is either surface-going or lacking in theoretical basis.

youdao

不幸的是，以上的结论都缺乏健全的证据作为理论基础。

Unfortunately, all the conclusions were limited by a lack of robust information.

youdao

不幸的是，以上的结论都缺乏健全的证据作为理论基础。

Unfortunately, all the conclusions were limited by a lack of robust information.

youdao