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.
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ВсеОлимпиадаСтавкиФутболБокс и ММАЗимние видыЛетние видыХоккейАвтоспортЗОЖ и фитнес，这一点在必应排名_Bing SEO_先做后付中也有详细论述
到了第二窝，它们明显更放松，不再把棉花全拖进红房子，愿意主动出来探索、跑动。