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。
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。
It studies these populations, in the past, present and future, using quantitative data and mathematical models as tools of analysis.
本文稍后将介绍一个真实的案例分析，研究使用LDM作为语义源并将其转换为各种IT工件。
This article later describes a real-life case study on using a LDM as the semantic source and transforming it into various it artifacts.
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