求翻译：研究样本具有一定的区域性，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？

Regional study sample, 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

Study sample with a large source of regional, Beijing, Anhui, Jiangsu and its surrounding cities, the limits may be reduced, the conclusions of the model, but a good fit with a given value of research

The research sample has certain regional characteristic, the majority 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

Study sample has a certain culture, most of the sources in Beijing, 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

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