求翻译：研究样本可能存在一定的区域性，因为大部分来源北京、安徽、江苏及其周边城市，该局限可能会降低结论的普适性，但是模型拟合较好，体现了一定的研究价值。是什么意思？

The study sample there may be some regional, because most of the sources in Beijing, Anhui, Jiangsu and its surrounding cities, the limitations may reduce the universality of the conclusions, but the model fit better reflects the value of research.

There may be a research sample of regional, as most sources, Beijing, Anhui, Jiangsu and its surrounding cities, the limits may be reduced, the conclusions of the model fit, but it is better, and with a certain amount of research value.

The research sample possibly has certain regional characteristic, because majority of originates Beijing, Anhui, Jiangsu and the peripheral city, this limitation possibly can reduce the conclusion the universality, but the model fitting was good, has manifested certain research value.

Culture of the study sample could potentially be, because most of the sources in Beijing and Anhui, Jiangsu and its surrounding cities, the limitations may reduce the universality of conclusions, but the model fits better, reflects a certain amount of research value.

正在翻译，请等待...