石窟明窗【英】

exposed grotto window

定义

石窟甬道上部壁面另开的窗口，以作窟内采光、通风及造窟时方便于排除废渣用。

It is a kind of additional windows dug in the upper part of the sides of the corridor for light, ventilation, or for getting rid of waste while the grotto is constructed.