Hmm, the user is asking about the "Peach Garden Four Swearing Brotherhood" (桃园四结义) meme. This is interesting because the traditional story is about three brothers - Liu Bei, Guan Yu, and Zhang Fei.
Looking at the search results, I see several different interpretations of this "fourth brother" concept. First, there's the academic analysis of the original Peach Garden Oath tradition in Romance of the Three Kingdoms. Then appear modern creative works that literally add a fourth character - either a time-traveling modern person (like Fuwa in one story) or an original character (like Chen Yuan or Peng Yuyan in novels).
The user seems internet-savvy since they used the word "meme", so they probably encountered this in online culture contexts rather than classical literature. The phenomenon appears to be a creative subversion where authors play with the iconic "three brothers" trope by inserting various fourth characters - sometimes comedic (like the modern person bewildering ancient heroes with technology), sometimes powerful (like the novel characters who become legendary).
I should explain both aspects: 1) the original historical/cultural reference 2) how it evolved in modern creative works. The key is showing how a 1800-year-old cultural meme gets remixed by each generation. The time-travel stories are particularly funny examples of this - like someone bringing a smartphone to ancient heroes.
Since the user asked in Chinese but included English terms like "meme", I'll keep the response in Chinese but with clear explanations of the creative adaptations. The tone should be lighthearted since many of these are humorous takes, while still acknowledging the original significance.
“桃园四结义”并非传统典故，而是在现代创作（尤其网络文学）中对经典“桃园三结义”的创意改编，核心是在刘备、关羽、张飞之外加入“第四人”，衍生出不同维度的趣味梗：
1. 「传统内核」：刘关张“三结义”的文化根基
《三国演义》中“桃园三结义”是千古传颂的忠义符号：刘备（胸怀大志却出身微寒）、关羽（亡命豪杰）、张飞（屠户却重情义）在桃园结为兄弟，誓“救困扶危、上报国家、下安黎庶”，成为乱世中“理想主义联盟”的原点。其精神内核（结义情、报国志）是中华文化“义”字的经典缩影，也奠定了“结义”的叙事范式。
2. 「现代创作」：“四结义”的创新演绎
当代创作者为突破经典、增添趣味，让“第四人”以各种形式介入，形成“梗”的多元方向：
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▷ 穿越者视角（搞笑+文化碰撞）
如短篇《桃园四结义》（福娃版）：现代人“福娃”穿越三国，用手机、MP3等现代物品“震撼”刘关张，最终被拉入结义队伍。这类创作主打古今认知错位——刘备对“手机不是鸡”的困惑、关羽对“机器人玩具”的懵懂，用荒诞感解构经典，是“玩梗式”的娱乐化改编。 -
▷ 原创主角（热血+系统/玄幻）
网络小说中，“第四人”常成为“金手指载体”：- 《三国之桃园四结义》（勿语先森）：主角彭玉宴穿越后获“系统”，要求必须与刘关张“四结义”，并获得咏春拳、时间暂停等能力，甚至被张飞夸“天下无敌”。这类剧情强化**“个人能力+团队羁绊”**，让“四结义”成为主角成长的核心契机。
- 《三国:开局桃园四结义》（过气的咸鱼）：在玄幻版三国中，主角陈元抱刘备大腿，意外成为“四弟”，后续卷入天下争霸。故事融合玄幻元素（武道九品、神打），让“四结义”成为乱世格局的新变量。
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▷ 反套路解构（黑色幽默+历史反思）
如《桃园反目》：主角楚飞穿越后成为“四弟”，却因熟知历史结局（蜀汉衰落、关羽败走麦城等），在结义时纠结“要不要发‘同年同月死’的誓”——既想融入团队，又怕重蹈覆辙。这类创作跳出“歌颂结义”的惯性，转向对历史宿命、人性选择的反思，“四结义”成为撬动经典叙事的支点。
3. 「梗的本质」：经典IP的“二次创作狂欢”
“桃园四结义”是网络时代对传统IP的解构与再创作：
- 对读者/观众：它是“打破经典边界”的趣味入口——看现代人如何在古代“混江湖”，看原创主角如何改写三国史；
- 对文化：它证明经典并非“不可触碰的神龛”，而是能持续引发创意火花的活态文本。
简言之，“桃园四结义”的“梗”，本质是以“加一人”为切口，把《三国》从历史叙事拉进现代娱乐场，让忠义、热血、搞笑、脑洞等元素在“第四人”的介入下碰撞出新火花~ 647