由于逻辑或物理模型是现实中的系统的抽象，它通常非常复杂，由很多构建块和关系组成。
Because a logical or physical model is an abstraction of the real-world system, it is usually very complicated, and it consists of many building blocks and relationships.
使这种情况进一步复杂化的是，相关数据可能散布在多个系统之中，承载在不同的网络上，或者驻留在各种各样的物理位置。
To further complicate the situation, the data of interest may be spread among multiple systems, hosted on different networks, or housed in a variety of physical locations.
对于象股市、地震和森林火灾等复杂的系统，物理学家们了解的一点是，当变化发生时，它们的规模不变。
One thing that physicists have learned about complex systems, such as stock markets, earthquakes, and forest fires, to name just a few, is that when changes occur they are scale invariant.
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