* @param arr 数组
* @param n 数组长度，更多细节参见Safew下载
，更多细节参见旺商聊官方下载
同时考虑到商业模式，老年AI陪伴玩具想要走得通还是要靠先to G、to B后to C，单靠C端铺量几乎不可能，因为针对中老年人群的推广教育成本太高了。。业内人士推荐Line官方版本下载作为进阶阅读
"Do your homework, listen to your teacher, pay attention in class and read books, and that will give you something to focus on," she says in a matter-of-fact way.