章节小标题生成助手

- 为啥偏爱夜跑：白天忙、夜里爽
- 光影与心跳：夜色里的跑者心态
- 城市路线怎么选：公园、河道、商圈与高架下
- 安全第一：反光、照明与“有人气”的路
- 夜跑装备清单：灯、鞋、表、臂包一应俱全
- 配速与训练法：夜间专属的强度与恢复
- 下班到开跑怎么吃：晚餐与补给不打架
- 跑后放松与睡眠：别让肾上腺素坏了觉
- 女生夜跑更安心：结伴、路线与自我保护
- 天气与季节攻略：夏夜闷热、冬夜寒风怎么跑
- 社群与约跑：从陌生人到“夜跑同盟”
- App与数据党：用科技点亮夜路
- 音乐与节奏：夜跑歌单的搭配心法
- 夜跑摄影与分享：灯光、构图和不过度“摆拍”
- 都市礼仪与边界：与行人、骑行、车流安全共处
- 夜经济链接：便利店、咖啡与城市脉搏
- 与城市对话：通过脚步重新认识街区
- 心理减压指南：把焦虑留在路灯下
- 风险与应急：突发状况的B计划
- 低影响夜跑：安静、不打扰、垃圾带走
- 夜赛与活动：夜光跑、接力与城市主题赛
- 未来趋势：更智能、更安全、更社交的夜跑时代

Here’s a punchy set of subheadings to take readers from zero to data-savvy, without the headache:

- Start Here: What Data Analysis Actually Is (and Isn’t)
- The Analyst’s Toolkit: Spreadsheets, SQL, and One Scripting Language
- Data 101: Rows, Columns, Types, and the Weird Edge Cases
- The End-to-End Workflow: Question → Data → Clean → Explore → Model → Communicate
- Framing the Problem: Turning Vague Goals into Testable Hypotheses
- Finding Data That Doesn’t Suck: Files, APIs, Web Scrapes, and Databases
- Cleaning Without Crying: Missingness, Duplicates, Outliers, and Typos
- Tidy Data in Real Life: Long vs. Wide and Why It Matters
- EDA First: Visual Patterns Before Fancy Models
- Descriptive Stats That Matter: Distributions, Spread, and Percentiles
- Visuals That Tell the Truth: Picking the Right Chart (and Avoiding Chart Junk)
- SQL for Humans: Joins, Aggregations, and Window Functions
- Python/R for Analysts: Pandas or dplyr for Everyday Work
- Feature Engineering Basics: From Raw Fields to Useful Signals
- Intro to Inference: Confidence Intervals, p-Values, and What They Actually Mean
- Practical A/B Testing: Power, Sample Size, and Trustworthy Results
- Causality Lite: Correlation, Confounding, and When to Randomize
- Everyday Probability: Bayes’ Rule Without the Headache
- Regression Without Tears: Linear, Logistic, and Regularization
- Classification vs. Clustering: Supervised and Unsupervised at a Glance
- Model Evaluation That Holds Up: Cross-Validation, Leakage, and Solid Metrics
- Time Series in the Wild: Trends, Seasonality, and Forecasts That Don’t Drift
- Text Mining 101: Clean, Tokenize, Vectorize, Interpret
- Geospatial Basics: Points, Polygons, Projections, and Pitfalls
- Scaling Up Smartly: Warehouses, DuckDB, and When to Use Spark
- Reproducible by Default: Notebooks, Scripts, Environments, and Version Control
- Data Quality & Governance: Lineage, Catalogs, and Access Done Right
- Dashboarding with Purpose: KPIs, Alerts, and Living Metrics
- Storytelling That Lands: Narrative Arcs, Visual Hierarchy, and Executive Summaries
- Ethics & Privacy: Bias, Consent, and Responsible Analysis
- Collaboration That Doesn’t Hurt: PRs, Code Reviews, and Pairing Patterns
- Packaging Your Work: Reports, Apps, and Reusable Pipelines
- From Analysis to Action: Communicating Trade-offs and Recommendations
- Portfolio That Gets You Hired: Project Ideas and What to Showcase
- Common Pitfalls: Simpson’s Paradox, p-Hacking, and Other Gremlins
- Checklists & Templates: From Brief to Debrief, Step by Step

Feel free to mix, merge, or reorder based on your audience—these flow from fundamentals to advanced practice without skipping the unglamorous (but essential) bits.

以下是“家用空气净化器买家指南”的小标题建议，顺着买前搞懂—怎么选—怎么用—怎么维护的逻辑排好队，读起来不费劲：

- 开篇热身：你家空气里到底有什么？
- 基础扫盲：PM2.5、甲醛、VOC和过敏原，别再傻傻分不清
- 指标不迷路：CADR、CCM、ACH 一次讲透
- 尺寸匹配术：按房间体积算风量，买大不如买对
- 滤网全家桶：HEPA等级、活性炭、预过滤，各司其职
- 除菌与除病毒：真本事 vs. 黑科技噱头
- 甲醛与异味终结者：活性炭看“量”和“接触时间”
- 噪音和睡眠：分贝之外的体感差异
- 24小时开着费不费电：能耗、待机和省电技巧
- 智能不等于好用：传感器、自动档、App和联动怎么选
- 安全优先：臭氧、紫外、离子功能要不要开
- 认证与标准读秒通关：GB/T 18801（最新版）、GB 34914能效、AHAM、CARB、UL 2998
- 维护成本账本：滤网寿命、价格、货源与真假辨别
- 摆放有讲究：离墙多远、门窗怎么开、全屋怎么布置
- 不同场景攻略：雾霾天、过敏季、宠物家、装修后
- 租房/小户型选购法：便携、低噪、性价比组合拳
- 预算分层选：入门—进阶—旗舰，差在哪儿
- 避坑清单：虚标CADR、玩概念、以小机当大机
- 下单前最后核对：一页搞定参数对比与优先级
- 到手自测：用PM2.5/粒子计数器验证效果
- 异味与异响排查：新机散味、风道清洁与售后求助
- 长期持有友好度：耗材周期、噪音衰减、保修与支持
- 生态与环保：能效等级、滤网回收与低化学释气选材
- FAQ：十个你一定会问的问题（我先替你问了）