据千问“春节30亿大免单”第一波活动数据，千问的订单中有156万老年人通过千问首次体验AI外卖服务。
Both of them expressed the importance of "getting out of [their] comfort zone", despite age.
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curr = curr-next;
// 易错点4：条件写成"<"而非"<="，会导致相同值的元素被错误保留，更多细节参见同城约会