After teaching them these two mathematical ways by some simple examples, we gave them a few class work questions.

在我们举了几个简单的小例子后，同学们又练习了几道我们胡编的关于家喻户晓的“小明”的应用题。

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West, who today is a Distinguished Professor at the Santa Fe Institute, spent several years studying an enormous array of variables sourced from Census Bureau data, government web sites, libraries and elsewhere and developed a few simple, mathematical equations to explain how cities work.

FORBES: Physicist Geoffrey West on Solving the Urban Puzzle