世界卫生组织在2021年发布的新版《全球空气质量指南》中，将PM2.5年均浓度指导值由10微克/立方米收紧至5微克/立方米。美国和欧盟于2024年先后将PM2.5年均浓度限值收紧至9微克/立方米和10微克/立方米。
The immediate dilemma: what does it mean for English instruction that all pupils now have access to free online chatbots that can produce fluid, fairly complex prose on demand? This question sits atop a teetering pile of timeless pedagogical quandaries: What are we actually trying to do in school? How should we go about doing it? How do we know if we’ve succeeded? I was a newcomer, negotiating all of this for the first time. Throwing AI into the mix felt like downing a coffee in the middle of a panic attack.，更多细节参见搜狗输入法下载
The Notification Cooldown under Settings specifies how much time must pass between two warnings. Default is 10000 ms, which is 10 s.，更多细节参见Line官方版本下载
Finally, each response is signed with Ed25519. Public-key signatures are notoriously expensive and are usually the dominant cost in systems like this.