历史记录显示，在19世纪中叶，女孩初潮的平均年龄在16至17岁之间。进入20世纪后，这一数字持续下降，到20世纪末和21世纪初，许多国家的女孩平均初潮年龄已接近12岁。这种变化并不只体现在月经初潮上，作为青春期最早出现，也最稳定的生理标志之一，乳房发育的时间同样在整体前移。
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that they first said this and I didn’t really take it serious because I was too busy learning Perl, and realizing，详情可参考搜狗输入法2026
Here we use pattern semantics; the default in Ostrich since they are also constraints as opposed to searches. The regex is assumed to match the entire string. This means that we are using stronger semantics than what a typical backend would have applied for the same regex. Our Black Ostrich paper mentioned above does a more involved comparison of anchor handling.