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正式与非正式
情景 · Scenario：
根据对象切换语气：邮件、会议、闲聊。
Shifting register for email, meetings, and small talk.
点击右侧喇叭可朗读整段对话，点击每句话旁的小喇叭可单句跟读。
对上级/客户用正式（regret to inform, kindly note）；对同事可用随意（heads up, FYI）。误用语域比语法错误更尴尬。
Use formal with superiors/clients (regret to inform, kindly note); casual with peers (heads up, FYI). Wrong register is worse than a grammar slip.
给客户发延误通知，最得体的是？