cen.ter.line
n.（名词）A painted line running along the center of a road or highway that divides it into two sections for traffic moving in opposite directions, or, in the case of a divided highway, for lines of traffic moving in the same direction at different speeds.中线：沿马路或公路中间刷的一条线，将公路分为两部分以使车辆双向行驶，或在分速公路上使车辆以相同的方向不同的速度行驶
