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。
Researchers can use the observations to infer not just how far away the galaxy lies but also the overall scale of the universe and some details of its expansion.
研究者不仅可以利用观测结果来推知星系有多么遥远，还可以推知宇宙的整个大小及其膨胀的一些细节。
Another strange image taken not far away shows a Stonehenge-like arrangement of objects radiating outward, with fighter jets parked at its center.
在不远的地方，拍摄到的另一张奇怪图片。它好像表示有一个像巨石阵那样安排向外辐射的物体，在其中心位置停驻着一些战斗机。
Not far away from the bridge was a six-storied building. To its right was a second-hand bookstore.
离桥不远有一座六层楼房，楼房的右面是一家旧书店。
Not far away from the bridge was a six-storied building. To its right was a second-hand bookstore.
离桥不远有一座六层楼房，楼房的右面是一家旧书店。
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