Moe has a grass shearer in his mouth and ultrasonic range finders to keep him from crashing into things. 莫伊的嘴巴里安装有割草机，身上还装有防止碰撞物体的超声波测距仪。
The experimental results showed that the ultrasonic rangefinder doesn't fit to explore the circular surface of small radius of curvature. 实验结果表明，超声波测距仪不适合曲率半径小的圆弧曲面探测。
