Casting defects, especially porosity, will reduce fatigue strength of the crank-shaft.

铸造缺陷，尤其是铸造缩松，降低了曲轴的疲劳强度。

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During the Carbonate gas reservoir's numerical simulation process, it is often short of exact and quantitative fracture model, especially porosity and permeability models.

碳酸盐岩油气藏在数值模拟的过程中往往缺少准确定量的裂缝模型，尤其是裂缝孔隙度和渗透率模型。

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Porosity is closely related with the diagenesis, especially the development of secondary pores.

孔隙演化与该区的成岩作用关系密切，特别是次生孔隙的发育。

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