对于第一个标准，已有大量的研究，但对第二个标准则讨论较少。

For the first criteria, there are many studies, but there is little discussion on the second one.

youdao

对于第一个标准，已有大量的研究，但对第二个标准则讨论较少。

For the first criteria, there are many studies, but there is little discussion on the second one.

youdao