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。

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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。

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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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