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.
作为一种新型河工建筑物，桩柱透水丁坝对局部水流的影响亟需可靠的定量研究。
As a new fashion river regulation building, it is necessary to research the effect of pile permeable groins to local flow quantitatively.
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