以下是几个可能有用的公式：
1. 介绍自己：你可以开始谈论你的名字、学校、职位等等，以此来向听众介绍自己。
例如：- "Hello everyone, my name is [name] and I'm here to talk to you today about [topic]."
2. 引入话题：你可以通过谈论当前的话题或天气来引入演讲。例如：- "Hello everyone, today it's raining outside, which makes me think about [topic] because I'm also currently working on a project related to it."
3. 引用名言或谚语：你可以引用一个名言或谚语来开始你的演讲。例如：- "Remember, the first step is always the hardest."
4. 提出问题：你可以开始谈论一个有趣的问题或现象，以激发听众的兴趣。例如：- "Hello everyone, have you noticed how much attention online shopping has become lately? I mean, how could you not with all the discounts and deals available?"
5. 介绍你的研究或调查：如果你正在谈论一个特定的主题，你可以开始介绍你的研究或调查。例如：- "Hello everyone, I'm here to talk to you today about [topic] because I recently completed a survey on the topic and found some really interesting results."这些公式并不是万能的，你需要根据你演讲的主题和听众的情况来选择最适合的开场白。
