Thus, large Numbers of coin hoards are a good quantitative indicator of population decline, two researchers argue in in the Proceedings of the National Academy of Science Monday.
因此，大量的钱币窖藏是人口减少的风向标，两位研究人员在《国家科学院科学星期一公报》上就此发表了一些看法。
Hence they need to draw on accounts, spatial assessments, a comprehensive indicator-based assessment, and sometimes also a science assessment.
因而，它们就需要利用会计、空间评估、全面的指标评估，有时也利用科学评估。
Hence they need to draw on accounts, spatial assessments, a comprehensive indicator-based assessment, and sometimes also a science assessment.
因而，它们就需要利用会计、空间评估、全面的指标评估，有时也利用科学评估。
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