We need to write article with title already determined, but do not output title, just the body. Must be 1500+ words, at least 1050, but requirement is 1500+ words, cannot be less than 1050. Must be 6-8 paragraphs, each 150-250 words. So total 6-8 * 150-250 => min 900, max 2000. Need 1500+ words, so we need about 7 paragraphs of ~215 words each = 1505 words, or 8 paragraphs of ~188 words each = 1504 words. Let's aim for 7 paragraphs, each about 215 words, total ~1505 words. Must be natural, conversational, no AI filler words, no banned words. Must avoid official jargon, no "、". Use natural transitions, short sentences, active voice. Avoid those banned words: 开头禁用 includes "", "". Transition禁用: "、". Ending禁用: "让我们...、。其实，级联操作是数据库在维护数据完整性时的一项自动化手段，它让一张表的变动能够直接波及到另一张表，而不需要我们手动去写额外的代码。标题里提到的‘数据库级联操作详解，轻松掌握级联用法’，正是想把这背后的原理拆解得更直观，让开发者能够在设计表结构时，轻松决定何时使用级联、何时保持独立。接下来，我会从概念、实现、常见场景到注意事项，一步步展开，帮助你在实际项目里把握住级联的用法，避免踩坑。"
Count words: Let's count roughly. I'll count words manually.
"如果(1)你2刚3接触4数据库5外键6关系，7看到8级联9配置10可能11会12觉得13有点14陌生。15其实，16级联17操作18是19数据库20在21维护22数据23完整性24时的25一项26自动化27手段，28它29让30一张31表的32变动33能够34直接35波及36到37另一张38表，39而不40需要41我们42手动43去44写45额外的46代码。47标题48里49提到的50‘数据库级联操作详解，轻松掌握级联用法’，51正是52想53把54这55背后的56原理57拆解58得59更60直观，61让62开发者63能够64在65设计66表结构时，67轻松68决定69何时70使用71级联、何时72保持73独立。74接下来，75我76会77从78概念、实现、常见79场景80到81注意事项，82一步步83展开，84帮助85你86在87实际88项目里89把握住90级联的91用法，92避免93踩坑。"
That's about 92 words? Actually I counted up to 92 words? Let's recount: I numbered up to 92 maybe. Actually I counted up to "踩坑。" as 92. So paragraph is ~92 words, far short of 150-250. Need 150-250 words per paragraph. So need to expand.
We need each paragraph 150-250 words. So we need to write longer paragraphs. Let's aim for ~210 words each. So need to expand each paragraph.
Thus we need to rewrite each paragraph with about 210 words.
Let's produce 7 paragraphs of ~210 words each.
I'll write paragraph 1 ~210 words.
Paragraph 1: talk about title, intro, why cascade matters, etc.
Paragraph 2: concept of foreign key, referential integrity, cascade.
Paragraph 3: example delete cascade with tables orders and customers.
Paragraph 4: example update cascade with tables departments and employees.
Paragraph 5: multiple cascade actions, composite foreign keys, chain cascades.
Paragraph 6: performance, pitfalls, when to avoid cascade, testing.
Paragraph 7: wrap up, tie back to title, summary.
Now write each paragraph with about 210 words.
Let's craft paragraph 1 ~210 words.
"在日常开发中，数据库表之间的关系往往比我们想象的要紧密。尤其是当多个业务模块共享同一份数据时，一个小改动有时会牵动整个链条。标题里提到的‘数据库级联操作详解，轻松掌握级联用法’，正是为了帮助大家在设计数据模型时，能够快速弄清楚何时需要让一个表的变化自动同步到另一张表。比如，当我们删除一条客户记录时，是否应该顺手把这位客户的所有订单也一起清掉？又或者，当主键发生变动时，是否需要把外键同步更新？这些问题如果不清楚背后的机制，往往会导致数据不一致或者额外的维护成本。接下来的几段内容，我会把级联的基本原理、常见写法以及使用场景拆解清楚，让你在写代码时不再需要查文档手册，能够直接凭记忆决定合适的级联策略。"
Now count words roughly. Let's count quickly.
"在1日常2开发3中，4数据库5表之间6的7关系8往往9比10我们11想象的12要13紧密。14尤其是15当
