Take air pressure, for example. The familiar isobars on weather chartsdefine regions of equal pressure, similar to the elevation contours ona map. Indeed, an isobar can be thought of as a kind of "coastline",described by its own fractal law. But there’s a key difference: acoastline’s shape is defined only at one specific value of height – sealevel. In contrast, the isobars of air pressure form a whole array ofshapes at different heights, like Russian dolls nested within eachother. Air pressure is what mathematicians call a multifractal field,described by a whole set of power laws, rather than just one.
机器翻译的不要，认证回答的朋友一定有额外分…………
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