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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I want to tell you about the past, present and future of the human population. So let's start with a few problems.

我想告诉你们有关人口数量的过去、现在和未来。那么让我们从一些问题入手。

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Everything that we had thought that Milton was telling us in the lyric present -- telling us directly, now -- suddenly gets shoved back into the narrative past: "thus sang the uncouth swain." The past tense is important there.

我们想过的弥尔顿在这首抒情诗里,直接告诉我们的所有事，现在，都突然在过去的旁白中一涌而现了：,“吟唱着粗鄙的青年人“，这里的过去时态很重要。

耶鲁公开课 - 弥尔顿课程节选

"It was definitely challenging looking for old photos online and in libraries, " the past-present novice said.

CNN: Connecting the past to present tougher than it looks

His holdings -- past and present -- in some of the world's largest companies, like Gazprom and Goldman Sachs, have seen him make and lose billions at a time, only to resurface rich once more thanks to his propensity to convince banks to extend him credit.

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The resident past-meets-present expert says he's excited when new photographers bring their personal spin to the project.

CNN: Connecting the past to present tougher than it looks