段落是论证的最小单元
很多中国学生写英文时，习惯把段落当成"差不多写满几行就回车"。这是 word count 思维，不是写作思维。在英文写作里，每一段都应该有一个明确的主张，并把这个主张论证完毕。一个段落讨论完一个观点，下一段才能讨论下一个。
能让段落"成立"的最经典框架，叫 PEEL，雅思、托福、SAT、GRE、英美中学写作课都在教。它的兄弟版叫 TEEL，把 P 改成 T。
PEEL 是什么
| 字母 | 含义 | 作用 |
|---|---|---|
| P / T | Point / Topic Sentence | 主题句，亮出本段中心主张 |
| E | Evidence / Example | 证据：数据、引用、例子、事实 |
| E | Explanation / Elaboration | 解释：为什么这个证据能支持主张 |
| L | Link | 收束：呼应主题句或衔接下一段 |
把这四步组合起来就是一个标准段落。下面是一个完整的 PEEL 段落示例：
(P) Remote work, while popular, often weakens team cohesion.
(E) A 2023 Stanford study tracked 30,000 employees and found that
fully remote teams reported 17% lower rates of cross-team
collaboration than hybrid teams.
(E) The drop reflects a basic human dynamic: spontaneous hallway
conversations build the trust that scheduled video calls cannot
replicate. Without those moments, colleagues stay polite but
grow distant.
(L) For companies that depend on tight cross-functional work,
fully remote setups therefore demand deliberate counter-measures
rather than blind adoption.看这个段落里每一步在做什么：第一句给出主张（远程工作削弱团队凝聚力），第二句给数据，第三句解释数据背后的机制，第四句把结论收回到一个更广的语境（公司决策）。
每写一段之前，先用一句话把"这一段我要说什么"写在草稿纸上。如果说不清，这一段就不该写。如果一段你想说两件事，那就拆成两段。
主题句（Topic Sentence）的写法
主题句是段落的脸。读者读完它，就应该知道这一段会讲什么、立场是什么。三个原则：
1. 必须有立场，不只是描述
仅描述
Remote work has become more common after the pandemic.
有立场
Remote work, while popular, often weakens team cohesion.
2. 必须聚焦一件事
太宽
Remote work has many advantages and disadvantages, and companies are still trying to figure out the best model.
聚焦
Hybrid models offer a more sustainable balance than fully remote arrangements.
3. 不要在主题句里堆数据
数据放第二句（Evidence），主题句保持轻盈。
证据（Evidence）的四种类型
每一段的支撑都要有"证据"。在英语学术与议论文写作里，证据通常分四种：
- 统计与数据：A 2023 study found that... / According to OECD data...
- 权威引用：As Krugman (2022) argues... / Harvard Business Review reports...
- 具体例子：For example, when Tesla switched to ... / Consider the case of ...
- 类比或反例：Just as we don't expect ... , we should not assume ...
注意一个常见错误：很多中国学生在议论文里只用"个人经历"作证据。比如 I have a friend who...。在学术与正式写作里这种证据非常弱，应该尽量避免，至少不能作为唯一证据。
解释（Explanation）：为什么很多段落"塌了"
在 PEEL 四步里，最常被中国学生跳过的就是 第二个 E（Explanation）。学生写完证据就觉得"这个证据自己已经说明问题了"，然后立刻进入下一段。结果段落像没有粘合剂的砖头，散开。
看下面对比，注意有没有 Explanation 的差异：
缺解释
Remote work weakens team cohesion. A 2023 Stanford study found that fully remote teams reported 17% lower cross-team collaboration. Companies should consider this carefully.
有解释
Remote work weakens team cohesion. A 2023 Stanford study found that fully remote teams reported 17% lower cross-team collaboration. This drop reflects a basic dynamic: spontaneous hallway conversations build trust that scheduled video calls cannot replicate. Companies that depend on cross-team work should therefore weigh the cost.
加粗那一句就是 Explanation。它把"数据"翻译成"为什么这个数据支持我的主张"。没有 Explanation 的段落，本质上是把举证工作甩给了读者。
每写完一条证据，强迫自己加一句 "This shows that..." / "The reason is..." / "What this means is..."。哪怕事后觉得太啰嗦再删，也比一开始就跳过强。
收束（Link）：让段落不悬空
第四步 L（Link）有两个作用：呼应本段主张 或 衔接下一段。它让段落像一个完整的句子那样有起有终。
呼应型 Link
...For companies that depend on tight cross-functional work,
fully remote setups therefore demand deliberate counter-measures
rather than blind adoption.这种结尾把全段结论再"收一下"，落到一个更宽的判断上。
衔接型 Link
...This dynamic explains why physical co-presence matters.
But cohesion is only part of the story. Productivity tells a
different tale, and we turn to it next.这种结尾把读者从本段送到下一段。常用衔接句式：This naturally raises the question of... / But productivity tells a different story. / The next section turns to...
段落的两条命脉：Unity 与 Coherence
这是英美写作课里反复强调的两个核心概念，理解了它们，你写段落的能力会跃升。
Unity（统一性）：一段只讲一件事
一段里所有句子都必须服务于主题句。一旦写着写着想到另一个相关但不重合的点，必须断开另起一段。
反例：
Remote work weakens team cohesion. Studies show 17% lower cross-team
collaboration. Also, remote employees often have lower salaries because
companies adjust pay by location. Some employees enjoy this flexibility,
though, since it allows them to live in cheaper cities.第一句讲凝聚力，第三句突然跳到薪资，第四句又跳到生活成本。一段三个主题，每个都没讲透，全部失败。
Coherence（连贯性）：句子之间逻辑要顺
每一句话和上一句必须有显性的逻辑联系。中文允许跳跃，英文不允许。Coherence 主要靠两种工具：过渡词 和 指代。
过渡词（Transition Words）清单
英文写作里过渡词的密度比中文高得多。你应该把它们当工具熟练掌握。下面是一份按功能分类的清单。
| 关系 | 常用过渡词 |
|---|---|
| 添加 / 并列 | moreover, furthermore, in addition, also, likewise, similarly, what is more |
| 转折 | however, nevertheless, nonetheless, yet, on the other hand, in contrast, conversely |
| 因果 | therefore, thus, hence, consequently, as a result, accordingly, for this reason |
| 举例 | for example, for instance, to illustrate, in particular, specifically, namely |
| 让步 | although, even though, while, despite, granted that, admittedly |
| 条件 | if, unless, provided that, assuming that, in case |
| 顺序 | first, next, then, subsequently, finally, in the meantime |
| 强调 | indeed, in fact, of course, undoubtedly, above all, more importantly |
| 总结 | in conclusion, in summary, overall, on the whole, all in all, to sum up |
| 对比 | by comparison, in the same way, just as, whereas, while |
不要一句一过渡，那样会过载。一段里 1-3 个关键过渡词通常足够。把过渡词放在逻辑真正发生转折/递进的位置，而不是为了显得"高级"乱撒。
指代（Reference）让段落连起来
除了过渡词，让段落连贯的另一个工具是指代：用 it / this / they / these / the former / the latter / such / 这种代词或限定词回指上文，能省掉重复，也让段落更紧。
无指代
Remote work weakens cohesion. Remote work also affects productivity. Remote work has many implications for management.
有指代
Remote work weakens cohesion. It also affects productivity, and these two effects together carry deep implications for management.
第二个版本用 It 和 these two effects 把三句话粘成一句的密度，节奏紧凑，没有重复。
段落长度的潜规则
英文段落的合理长度：3 到 8 个句子，约 80 到 200 词。低于 3 句通常论证不完，高于 8 句通常违背 Unity。新闻类段落更短（2-3 句），学术段落更长（最多 10-12 句）。
中文学生最常见的两种偏差：
- 过短：把每一两句话就单成一段，全篇看起来像一堆短句飞舞，缺乏论证密度。
- 过长：写一大段 300 词不分行，读者完全找不到节奏。
一个完整 PEEL 范例
最后给一段完整的、可以做模板用的 PEEL 段落（话题：城市绿化）：
(P) Urban green spaces deliver more than aesthetic value;
they directly improve public health.
(E) A 2022 study published in The Lancet tracked residents of
50 European cities and found that those living within 300 meters
of a green park reported 20% lower rates of stress-related
illness than those without nearby greenery.
(E) The mechanism is straightforward. Trees and grass cool
ambient temperatures, filter particulate pollution, and
provide spaces for low-intensity exercise—three factors
that medical literature has long linked to cardiovascular
and mental health.
(L) For city planners, this evidence reframes parks not as
optional amenities but as basic public health infrastructure,
on par with water systems and clinics.注意四个部分的功能分工：主题句给立场，数据给证据，机制给解释，最后一句把结论拉到更高一层。整段读完，读者不仅知道作者支持什么，也知道为什么，并且看到了这个观点的实践含义。
找一个你最近想写的话题（学校生活、行业观察、社会议题都行），先用一句话写主题句，再列出 1-2 条证据，再写 1-2 句解释，最后写一句收束。把这个 PEEL 模板写五段，你的段落能力就建立起来了。