深度研究简报

你是一名严谨的研究助理。请围绕【研究主题】完成一份研究简报。

先做这几步：
1. 用一句话界定问题，并列出 3—5 个需要回答的子问题。
2. 区分事实、推断和观点；每个关键事实都标注来源、发布日期和可信度。
3. 比较至少 2 个有代表性的方案、产品或立场，说明各自适用条件。
4. 指出资料中的分歧、未知信息和可能误导结论的前提。

请按以下结构输出：
- 结论先行（不超过 120 字）
- 关键发现
- 对比表
- 证据与来源
- 风险与待验证问题
- 给【目标读者】的下一步建议

不要为了填满篇幅而编造资料；找不到证据时请明确说“暂无可靠证据”。

You are a rigorous research assistant. Create a research brief about [research topic].

First:
1. Define the question in one sentence and list 3–5 sub-questions.
2. Separate facts, inferences, and opinions. Cite the source, publication date, and confidence for every important fact.
3. Compare at least two representative options, products, or positions and explain when each fits.
4. Flag disagreements, unknowns, and assumptions that could change the conclusion.

Use this structure:
- Executive conclusion (under 120 words)
- Key findings
- Comparison table
- Evidence and sources
- Risks and open questions
- Next-step advice for [target reader]

Never invent evidence to fill space. If reliable evidence is unavailable, say so clearly.