单词 有凹口 例句 DEFINITIVE EXAMPLES 权威例句〔bridgeboard〕A notched board at either side of a staircase that supports the treads and risers.木楼梯侧板,木楼梯小梁:在阶梯两边支撑楼梯的踏板和竖板的有凹口的木板美国传统 英语例句辞典收录了559068条英语例...