施工人员正在路面上重新粉刷车道中心线。

The workers are repainting the ___centerline on the road.

画图时，先沿着中心线对折纸张以确保对称。

When drawing, fold the paper along the ___centerline to ensure symmetry.

篮球运动员必须站在中线两侧准备跳球。

The basketball players must stand on either side of the ___centerline for the jump ball.