方方正正地 meaning in Chinese

squarely

On a level with the floor on every stairhead there was a low window which resembled a deep , square venthole , while in lanterns fastened to the walls flaring gas jets crudely illuminatcd the surrounding squalor and gave out a glowing heat which , as it mounted up the narrow stairwell , grew ever more intense
每道楼梯的平台边，贴近地面都有一扇低矮的窗户，方方正正地凹进去，像是气窗。一些悬挂在墙壁上的灯笼，发出煤气光焰，强烈地照射着这种种贫寒景物，还散发出一股热气，向上升腾，并聚积在各层狭窄的螺旋形楼梯下。