对如上图之类照片的初步分析表明该彗星中间光滑的区域有许多孔状结构，正直接将冰块泄漏到宇宙中。
Preliminary analyses of images like that shown above indicate that the smooth regions around the middle are porous and leak frozen water vapor directly out into space.
砂槽模型是将天然的多孔介质区域按比例缩小的模型。
The sand box model is a reduced scale representation of the natural porous medium domain.
有界区域上多孔介质中可压缩可混溶驱动问题由两个非线性抛物型方程耦合而成：压力方程和饱和度方程均是抛物型方程。
Miscible compressible displacement in a porous media is modelled by a nonlinear coupled system of two parabolic equations: the pressure equation and the concentration equation.
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