我想告诉你们关于人类的过去、现在和未来的事情，所以让我们从一些问题入手。
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。
I want to tell you about the past, present and future of the human population. So let's start with a few problems.
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.
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