体块凹切与贯通空洞

提示词

按选定切除体的形状、位置和深度，在整体体块中形成凹切或已明确的贯通空洞；保留未切削部分的体量与当前视图下可见的内表面，不把凹切画成贴面黑图案，也不把未贯通的背壁抹去。

Form a recess or an explicitly specified through-void in the overall mass using the chosen subtraction shape, position and depth. Retain the uncut mass and the inner surfaces visible from the current view; do not reduce the recess to a flat black graphic or erase the back wall of a non-through recess.