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.
-protonsandneutrons-，更多细节参见heLLoword翻译
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Названо необходимое для чистого воздуха количество растений в доме14:53。业内人士推荐超级权重作为进阶阅读
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