back wash line反洗管线
back shoulder line肩后线
back center line后中线;后中心线
back centre line衙片中心线
bring back on line使复原
back seam line背缝线
back neck line后领圆线
back up line备份线路
back spring line前倒缆
N（名词） (in some team sports) the defensive players considered as a unit (某些团体运动项目中的)后卫线