Take the lattice as an example

格点───Grid point;例───example

Right: the robot turns right 90 degrees and remains on the current grid point.───左: 机器人向左旋转90度,并保持原先所在的格网位置不变.

Left: the robot turns left 90 degrees and remains on the current grid point.───左：机器人向左旋转90度，并保持原先所在的格网位置不变。

However, lost robots leave a robot "scent" that prohibits future robots from dropping off the world at the same grid point.───然而，损失的机器人会留下一些“信息素”，以免后来的机器人再从同一格坠落。

Thus the value of the function at any grid point is the average of its values at the immediately neighboring points.───因此，任一结点上的函数值就等于其直接邻点上函数值的平均。