一个简单的(虽然近似)模型的人口增长率是马尔萨斯的增长模式。
A simple (though approximate) model of population growth is the Malthusian growth model.
应该小心地对待结果，并且进一步研究是需要的支持观察和测试，如果近似结果在其他人口得到。
The results should be treated with caution, and further research is needed to support the observations and test if similar results are obtained in other populations.
英国从80年代起反感黑人老板的人口比例下降了一半，从20%到10%——美国也是近似的比例。
In the UK, since the 80s, the percentage of people who object to a black boss has fallen by half from 20% to 10% - a similar decrease to that in America.
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