在低孔隙率胶凝材料中，大量闭合孔的存在使压汞法出现大的“损失孔隙”。
A great number of the "close pores" are present in low-porosity cementitious materials, which can cause the mercury intrusion method to lose the "missing porosity".
检查各种门、窗、人孔盖、烟囱百叶窗、舱口盖操作的便利性和可靠性。检测烟囱百叶窗的闭合性。
Inspect the convenience and reliability of all kinds of doors, Windows, manhole covers, hatch. Inspect the closing of louver of funnel.
为了生存，吉文人进化出外骨骼，如同真空防护服一样，把自己的身体组织包裹在里面，闭合所有腔孔，进入冬眠状态。
To survive this, the Givin have evolved a means of sealing their entire anatomy in a form of organic exoskeleton vac-suit, sealing off all orifices and entering a state of hibernation.
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