黑线在地板上布置成迷宫状，整条轨迹线包含90度角的转弯，其它角度的转弯或是曲线，但不会出现线条交错现象。

The black line traces a maze on the floor. It may have 90 degree turns in it, turns of other angles, or curves. The line will never cross itself.

youdao

黑线在地板上布置成迷宫状，整条轨迹线包含90度角的转弯，其它角度的转弯或是曲线，但不会出现线条交错现象。

The black line traces a maze on the floor. It may have 90 degree turns in it, turns of other angles, or curves. The line will never cross itself.

youdao