常見(jiàn)例句A joist is any of a series of small parallel beams supporting a floor or roof.托梁是一系列的小列柱梁，用以支撐樓層或屋頂。The floor joist was cracked and fractured, but no debris was deposited in the basement, as the subflooring remained intact.地板托梁破裂折斷，但是在地下室竝未落下碎片因地板下麪安然無(wú)恙。 返回 trimmer joist