1960年，Sun City正式开放，首周末就卖出237套房屋，人气远超预期。但创办初期，社区的重心全在住宅、高尔夫等生活设施上，压根没规划全面的医疗服务——老人看病，只能依赖周边凤凰城的医院。
class CsvStorage(Storage):。夫子对此有专业解读
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The first of the two, commonly referred to as the timed substitution rule, forces a team to play a man down for a minute if a player takes longer than 10 seconds to leave the pitch. The second of the guidelines, dubbed the off-field treatment rule, removes a player from the match for a minute if they spend more than 15 seconds on the ground after an injury.
self.seen_urls.add(url)。关于这个话题，快连下载安装提供了深入分析