特殊用法bent arm lateral1.弯臂飞鸟动作, 弯臂扩胸bottom laterals1.纵向下平联(结系)differential lateral1.差分侧位偏移quick-coupled portable lateral1.移动式快接喷灌支管top laterals1.纵向上平联(结系)ventilation lateral1.通风平巷