目前，主要有两种分类方法：一是按理论模型和方法分类，二是按材料计算的特征空间尺寸 (Characteristic space scale)分类。材料的性能在很大程度上取决于材料的微结构，材料的用途不同，决定其性能的微结构尺度会有很大的差别。
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With the enlargement of the scale of question, the question space makes the characteristic of exploding up , is unlikely solved with general methods.
随着问题规模的扩大，问题空间呈现组合爆炸特征，无法用常规的方法求解。
The general so - called ground resolution of space remote sensing image is only a kind of ground scale corresponding to the fine characteristic scale of image.
通常所言的航天遥感图像的地面分辨率只是与图像细部特征尺度相对应的地面尺度。
With the enlargement of the scale of problem instances, the solution space makes the characteristic of exploding up, is unlike solved with general methods.
随着实例规模的不断扩大，解空间呈现组合爆炸特征，无法用常规的方法求解。
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