To date, the vast majority of cases have been detected and investigated in comparatively well-off countries.

至今为止，绝大多数病例都是在相对较富裕的国家中发现并进行调查的。

youdao

To date, the vast majority of cases have been detected and investigated in comparatively well-off countries.

至今为止，绝大多数病例都是在相对较富裕的国家中发现并进行调查的。

youdao