It studies these populations in the past, present and future using quantitative data and mathematical models as tools of analysis.

它使用定量数据和数学模型作为分析工具，研究这些人口在过去、现在和未来的情况。

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It studies these populations, in the past, present and future, using quantitative data and mathematical models as tools of analysis.

它使用定量数据和数学模型作为分析工具，研究这些物体在过去、现在和未来的数量。

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It is clear from these studies that good compression ratios are possible and the download time of Web content can be accelerated using HTTP compression.

从这些研究不难看出，好的压缩比是可能的，而且也可以通过HTTP压缩加速Web内容的下载时间。

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Granted, these studies were conducted using rats, and we have to acknowledge the metabolic differences of our rodent counterparts.

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These are curated using an algorithm: Twitter studies the accounts you follow and serves up similar stories.

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These two studies may raise the bar on companies that want to claim that their product, using technology to improve care, is truly effective.

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