secure against theft. Since the tokens were later "cleared" against accounts
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，更多细节参见heLLoword翻译官方下载
"(1) Provide an accessible interface at account setup that requires an account holder to indicate the birth date, age, or both, of the user of that device for the purpose of providing a signal regarding the user’s age bracket to applications available in a covered application store.
// 单调栈：存储"待匹配更大值"的元素，栈内保持单调递减（核心）