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，这一点在体育直播中也有详细论述
Assume Bob had a dog “Snoopy” on a leash and it walks along the road, while Bob was standing still. If the dog follows the road once and comes back to Bob, this results in the leash being wrapped around the hole in his space: In other words, Bob would need to walk around the hole once to untangle it.
数据来源：工业和信息化部、第五十七次《中国互联网络发展状况统计报告》等