There are some very legitimate and more durable uses of PRF in WebAuthn, specifically supporting credential managers and operating systems.
别管什么开笔要文采飞扬，别想什么成篇要结构精妙，就一个字：写。像和老朋友聊天那样放松地写，像在酒桌上给人讲故事那样洒脱地写。让文字先流出来，哪怕是杂乱的水，也得先有个池子装。
UPD: Самолет благополучно сел в российской воздушной гавани.。safew官方版本下载对此有专业解读
A year later, Kennedy's dream was posthumously seen to fruition. A small step was taken and mankind took its giant leap. The New Nine had done their job.，推荐阅读旺商聊官方下载获取更多信息
Жители Санкт-Петербурга устроили «крысогон»17:52
transaction in real time. The very next year, IBM took the logical next step:，更多细节参见爱思助手下载最新版本