In the real world with its imperfect surfaces, getting your robot not to veer into the wall on its left or veer too far away from that wall is quite a challenge in itself.
但是，在真实世界中墙的表面不是绝对平的，如何避免机器人靠向墙壁或离墙太远本身就是个难题。
The witch flew into a rage, jumped to the window, and as she could see far into the world, she saw her stepdaughter hurrying away with her sweetheart Roland.
老巫婆长着千里眼，一下就看见了她的继女，正跟着自己的爱人罗兰匆匆忙忙地远去。
The witch flew into a rage, jumped to the window, and as she could see far into the world, she saw her stepdaughter hurrying away with her sweetheart Roland.
老巫婆长着千里眼，一下就看见了她的继女，正跟着自己的爱人罗兰匆匆忙忙地远去。
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