他们把每月净收入的五分之一存起来。

They save one fifth of their net monthly income.

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因此，谢天谢地，现代操作系统允许你，把这里的文件进行分块，在这里存一部分，在那儿存一部分，但最后的结果是你的文件变成了分片的。

So thankfully, modern operating systems allow you to put parts of files here, parts of your file here, parts of your file here, but the end result is that your files get fragmented.

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比方说，经济学家可以画出35岁至59岁人群(存最多钱的一部分人)的比例与实际利率水平的关系曲线。

For example, economists can plot a relationship between the proportion of the population aged between 35 and 59 (when people save most) and the level of real interest rates.

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