开槽板面
plate with mini longitudinal channels at the surface
通风槽板槽孔
ventilative trough board slot
饱和式展开槽
CS-chamber (= chamber saturation chamber
chamber saturation chamber (= CS-chamber
爆破开槽
millisecond-delay blasting technique
闭开-开闭形态学梯度
close-opening-open-closing morphological gradient