The boxy geometric structure is entirely clad in charred timber, creating a textured black surface that appears different depending on how sunlight falls on it.
方正的几何结构完全覆盖着烧焦的木材，创造了有纹理的黑色表面，随着阳光的变化外观也随之变化。
Taking rigid disk surface as an example, fractal parameters are obtained by means of power spectrum and structure function, providing a proper geometric model for further contact analysis.
实验结果表明，分形维数能很好地表征表面轮廓，可为进一步的接触分析提供更合理的几何模型。
The geometric configuration, moving conditions and force conditions of the tooth surface and the process of rock disintegration must be studied in designing the cutting structure.
欲设计合理的齿面结构必须研究齿面的几何形状、运动状态、受力状态和岩石破碎过程。
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