time.sleep(2 ** attempt) # 指数退避
那时候的邮轮，才可能真正在中国扎根，成为大众旅游消费中一个常态化的选项。。关于这个话题，heLLoword翻译官方下载提供了深入分析
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In her survey, 22% of mothers and 20% of childless women picked such small gestures as one of the top two things that made them feel valued – more than big nights out or expensive presents.
各相关航运企业、船员船管公司：，更多细节参见雷电模拟器官方版本下载