translation.en: Now while these findings are suggestive, countries can be different in so many different ways that it's very, very difficult sometimes to account for all of these possible differences.
translation.zh: 现在虽然这些发现能说明问题， 但是比较的国家之间在很多很多方面都有差异， 有时候很难将这些差异归结为某个原因。