1)Falling Wedge,下降楔形2)lower entourage of the diagonal,下楔形集3)stepped-down formation,下降队形4)Falling Flag,下降旗形5)upper and lower wedge-shaped undercut,上下楔形大掏槽6)Down-hill simplex,下降单纯形
用法例句
The large upper and lower wedge-shaped undercut holes arrangement in the centre of the heading face is recommended based on the comparison and analysis of different undercut holes arrangements in excavation of the Xiganchi water conveyance tunnel located in weak and soft surrounding rocks using smooth blasting technology.
