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When Bob drives along the road past the stop sign, he will eventually return to the same point at which he started. However, he would reach invisible walls, it he intended to walk along the grass, or jump to the sky. The road is the only way to get around, and it loops back on itself.
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在使用中的航空器上使用可能影响导航系统正常功能的器具、工具，不听劝阻的，处五日以下拘留或者一千元以下罚款。
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