与乳房发育相呼应，更长期的出生队列分析提示，中国女孩初潮年龄在过去几十年中持续下降：全国性数据研究显示，初潮年龄从1970年代中期及更早出生队列的约14.25岁，下降到2000年后出生队列的约12.60岁，平均下降速率约为每10年0.51年。这一趋势与欧美及其他地区观察到的现象方向一致。
Iran enters critical talks on its nuclear programme with the US on Thursday, insisting a deal is in reach as long as Washington sticks by its willingness to concede Iran’s symbolic right to enrich uranium, allow Tehran to dilute its stockpile of highly enriched uranium, and not to impose controls on Iran’s ballistic missile programme.
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This is a normal property of zero-knowledge proofs, namely that any given “proof” should reveal nothing about the information proven on. In most settings this extends to even alowing the ability to link proofs to a specific piece of secret input you’re proving over, which is called a witness.
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