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。
In most MDA situations, the model-to-model mappings are complex and require careful design and implementation.Figure 1: mapping a simple entity to object and data design models.
在大部分MDA环境中，模型到模型的映射是很复杂的，并且需要进行仔细的设计和实现。
SLIDE is very simple to use, and yet complex models can be created and analyzed quickly and easily.
SLIDE非常便于操作应用，即使复杂的模型也可以迅速简便的建立和计算分析。
It has simple and practical characteristics to evaluate the effectiveness of the air force aero-complex generally based on the series-parallel connection models frame.
用串并联模型框架对军用航空综合体进行效能评估，具有简单实用的特点。
The present method was relatively simple to apply and could be used for evaluating experimental results and verifying more complex numerical models.
因此，在浓度较大时，采用线性吸附等温模线会得到偏不安全的结果。该解相对较简单，并可用于验证各种数值模型，拟合试验数据等。
The present method was relatively simple to apply and could be used for evaluating experimental results and verifying more complex numerical models.
因此，在浓度较大时，采用线性吸附等温模线会得到偏不安全的结果。该解相对较简单，并可用于验证各种数值模型，拟合试验数据等。
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