在计算机网络中，哪个协议负责在互联网上传输电子邮件？

在市场竞争中，以下哪一项策略最可能帮助公司建立品牌优势？

In a hypothetical scenario, a researcher claims that a specific vaccine causes a rare neurological disorder. If this claim is based on a study with significant methodological flaws, what is the most appropriate response from the scientific community?

社会治理体系中，哪一项是基础制度建设的关键？

焦虑可能隐藏在以下哪种情况之后？