Further, many of these models define an evolutionary path such as the one we noted above, which traces a progression in abilities and capabilities from simple and basic to more complex.
此外,许多模型定义了演进的路径,例如我们在上面所提到的,它追溯了功能和能力上的进展,从简单且基本的到更复杂的。
In practice, one model is not always enough and a complex system may be represented by a range of models, from simple to complex.
在实践中,一个模型常常是不够的,复杂的系统可以用从简单到复杂的多个模型表示。
Observations, which to an outsider might sound like simple things, are often remarkably difficult, and depend on complex models to make any sense at all.
对于门外汉来说可能是件简单的事情,但是这样的观测常常是很难进行的,并且需要依靠负责的模型来解释一切。
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