阿嬷那年结婚刚满一年，家里没有孩子。一次偶然的机会，她去医院陪人看病，有人提起她一直没动静，她顺口说了一句：“我想买个孩子。”
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）
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Like other electronics products, cameras have shot up in price in the US of late due to tariffs and other reasons. Fortunately, there are still many models available for less than the price of a budget smartphone ($750 or less) that offer great features for creators and photographers alike.