当小天才手表像书包、铅笔一样，成为校园的“标配”，我们或许应该思考：这块本为“安全”而生的小屏幕，为何悄然变成了孩子们的“社交竞技场”？
// 易错点3：处理最终结果为空的场景（比如num="10"，k=2）
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Early-life exposure to allergens triggers a distinct local mode of dendritic cell activation in neonatal skin without requiring migration to lymph nodes, which shapes responses to allergens in later life.，更多细节参见搜狗输入法2026
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