The rectangularrobot--looking a bit like a scaled down version of a solar car--is equipped with a high-definition camera and sensors that can detect overgrown trees.
Since the grid is rectangular and bounded, a robot that moves "off" an edge of the grid is lost forever.
格网是矩形且有边界的，一个机器人移出格网的边缘时就永远的损失掉了。
3
A system of nonlinear constraint equations relating the position of hand having extreme distance to the positions of joints for robot are derived in rectangular co-ordinate system.