The shell has to be slightly porous to enable oxygen to pass in.
外壳不得不有些细小的孔以便能使氧气通过。
Third Prize: Within the stacked volumes and light, porous and tall shell, the ecosystem, structure and functions of the tower have all been carefully considered.
第三名在叠叠量体与轻透挺立的外壳中，尊生态环境、结构行为、空间功能考虑深入。
Generally the numerical stimulation on flow field and temperature field of shell distance is based on porous medium model.
以往对换热器壳程流场和温度场的数值模拟都是建立在多孔介质模型基础上进行的，存在许多问题。
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