短语词组短语knee rafter 斜撑rafter roof 人字木屋顶fly rafter 飞椽flying rafter 飞檐椽;飞子upper rafter 脑椽ceiling rafter 顶棚搁栅compass rafter 弯曲椽;轮椽;轮橼cross rafter 天幕椽rough rafter 暗椽 返回 rafter