a double void 双重空场
double-face glue void ceiling height 天花高度
If vessel has double hull or sides are facilities available to inert ballast tanks and other void Spaces?
船舶是否是双层壳或双层侧，设备是否可进入惰气压载舱和其他空旷区域？
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Electric current flows through clayey soils by the conduction of void water, electric double layer and clay minerals.
粘性土是通过孔隙水、粘粒周围的双电层以及粘土矿物来导电的。
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