a wooden block built into a masonry wall so that joinery structure can be nailed to it
nog详细解释
nog n.(名词)A wooden block built into a masonry wall to hold nails that support joinery structures.木栓,木砖:嵌入石墙中的木块,以钉支撑细木构造物的钉子A wooden peg or pin.木栓或木钉 来源:[Origin unknown] [词源不明]