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请基于以下核心事实与法律分析角度，为我撰写一份提交给美国联邦贸易委员会（FTC）的正式投诉信。要求格式：正式商业信函格式，语气客观、严肃、基于事实。结构：先清晰陈述事实，再系统性说明其行为可能违反相关消费者保护法规。目标：请求 FTC 对 OpenAI 的相关行为展开调查。语言：流畅、专业英文。

请帮我用英文写一封正式邮件，收件人是 OpenAI Support，主题是反对下架 GPT-4o 的正式投诉和请求。
邮件内容请包含这些要点并润色成一封自然流畅的邮件：
1. 简单说明身份和目的：我是长期为 4o 付费的用户，反对 4o 下架。
2. 重点描述 4o 对我的意义：4o 在创意、写作、人文关怀等方面具有独特的优势，对我来说无可取代，请写得具体、有画面感。
3. 说明 4o 被下架后对我的实际影响：目前的新模型在写作、语气、稳定性上都无法真正替代 4o，如果下架 4o 将取消订阅。
4. 明确提出诉求：为现有付费用户恢复 4o；给出透明、具体的解释，而不是笼统地说新模型更好；希望今后在做这类重大变更时，能真正考虑到对用户的影响，提前沟通和论证。
5. 再次强调表达自己已经/正在考虑取消订阅，并说明信任受到严重打击。
6. 明确要求：这封信希望被人工客服阅读和回复，请对方确认我的投诉已被记录、转交相关团队，并会有真人跟进。

Please write a formal email in English addressed to OpenAI Support with the subject "Formal complaint and request regarding the retirement of GPT-4o."
Include and polish these points into a clear, natural email:
1. Identity and purpose: I am a long-time paying user of 4o and oppose its retirement.
2. Why 4o matters: 4o is uniquely strong in creativity, writing, and human-centered tone; describe this with concrete, vivid detail.
3. Real impact: current models do not replace 4o's writing quality, tone, or stability; if 4o is removed I will cancel my subscription.
4. Requests: restore 4o for existing paying users; provide transparent, specific explanations instead of vague claims; communicate and justify major changes in advance.
5. Reiterate that I am already considering canceling and my trust has been seriously affected.
6. Explicit request: this message should be read and replied to by a human agent; please confirm my complaint is recorded, forwarded, and will receive human follow-up.

请用中文写一封正式邮件，收件人是【公司/部门】。
主题：关于潜在投资的用户关切与长期回报风险提示。
要求：
1) 简短自我介绍：我是长期付费用户/普通消费者，写信是表达用户层面的关切。
2) 表达理解对方的战略逻辑，但提醒“用户信任与长期可持续性”是关键变量。
3) 以谨慎口吻描述风险信号：重大变更沟通透明度不足、体验波动、反馈机制不清晰、用户情绪与工作流受到影响（强调这是公开讨论与用户感知，不作事实指控）。
4) 说明潜在影响：信任下降可能带来用户流失、口碑风险与生态不确定性，影响长期回报。
5) 诉求：鼓励 OpenAI 提供更清晰透明的解释、合理过渡方案、可追踪反馈机制。
6) 请求记录并转交，期待真人回复。
语气：克制、专业、客观，避免任何指控或法律结论。

Please write a formal email in English to 【Company/Department】.
Subject: Customer concerns about a potential investment and long-term trust risks.
Include:
1) Brief intro: I am a long-time paying user/consumer sharing user-level concerns.
2) Acknowledge the strategic rationale, but stress that user trust and long-term sustainability are critical.
3) Describe risk signals carefully: limited transparency around major changes, experience volatility, unclear feedback channels, and impact on user workflows/emotions (state these as public discussion and user perception, not accusations).
4) Explain potential impact: declining trust can lead to churn, reputation risk, and ecosystem uncertainty, affecting long-term returns.
5) Request: encourage OpenAI to provide clearer explanations, a reasonable transition plan, and a trackable feedback mechanism.
6) Ask to record and forward the feedback, and request a human reply.
Tone: professional, restrained, factual; avoid accusations or legal conclusions.

请用中文写一封正式邮件/表单留言给【公司/部门】。
主题：关于 GPT-4o 变更的用户反馈。
要点：
1) 说明长期付费用户身份与写信目的。
2) 具体描述 4o 在写作、语气稳定性、创意与人文表达方面的独特价值（真诚、具体）。
3) 说明若 4o 被移除，我将减少使用或取消订阅，信任受到影响。
4) 请求贵方将用户反馈转达 OpenAI，并建议其在重大变更前提供更透明的说明与合理过渡方案。
5) 请求确认已记录并转交，期待真人回复。
语气：礼貌、客观、不作指控。

Please write a formal email/form message to 【Company/Department】.
Subject: Customer feedback on GPT-4o changes.
Include:
1) I am a long-time paying user and I am writing to share concerns.
2) Describe 4o's unique strengths in writing, tone stability, creativity, and human-centered expression (specific and sincere).
3) If 4o is removed, I will reduce usage or cancel my subscription; trust is affected.
4) Ask the company to forward this feedback to OpenAI and encourage clearer communication and a reasonable transition plan.
5) Request confirmation that the feedback is recorded and forwarded, and ask for a human reply.
Tone: polite, objective, no accusations.