PDF Book Translator (English → Chinese)
Three-mode translation skill for turning English PDF books into natural, fluent Chinese. The core commitment is sentence-by-sentence fidelity — every sentence in the original must exist in the translation, with no meaning added or lost — while reading as if written by a skilled Chinese author.
Modes
Choose the right depth for the task:
| Mode | Trigger | Steps | Best for |
|---|---|---|---|
| Quick 速译 | "快翻", "quick", "速译" | Read → Translate | Quick look, short standalone pieces, checking what a passage says |
| Normal 标准 | default, "翻译", "汉化" | Analyze → Translate | Most book chapters, blog posts, general content |
| Refined 精翻 | "精翻", "refined", "精细翻译" | Analyze → Draft → Review → Revise → Polish | Publication-quality output, key chapters, final delivery |
Auto-detection
- "快翻", "quick", "直接翻译", "快速翻译", "速译" → Quick
- "精翻", "refined", "精细翻译", "出版级", "深度翻译", "精译" → Refined
- Everything else → Normal (default)
Mode upgrade
After Normal mode completes, ask:
翻译已保存。如需进一步审校润色,回复 "继续润色" 或 "refine"。
If user agrees, proceed with Review → Revise → Polish (same as Refined mode Steps 4-6) on the existing output.
Style Presets
Control the voice and tone of the Chinese output:
| Style | When to use | Characteristics |
|---|---|---|
literal 逐句忠实 |
Technical manuals, legal docs, when precision is paramount | Closest to English sentence structure, minimal restructuring |
storytelling 叙事流畅 |
Novels, memoirs, narrative non-fiction | Smooth transitions, vivid phrasing, natural Chinese rhythm |
elegant 文采典雅 |
Literary fiction, poetry, refined essays | Polished prose, four-character phrases, rhythmic beauty |
academic 学术严谨 |
Scholarly works, textbooks, research | Formal register, precise terminology, citation-aware |
conversational 口语自然 |
Dialogue-heavy books, informal memoirs, self-help | Casual, approachable, as if speaking to the reader |
If no style is specified, detect from the book's content and tone. For most books, storytelling is a safe default. literal is recommended for technical reference material.
Core Translation Philosophy
信 Faithfulness — The anchor
- Every English sentence must have a corresponding Chinese sentence
- Facts, numbers, logic, and proper names must match exactly
- Never summarize, skip, or embellish
- Every paragraph break, emphasis, and structural choice from the original must be preserved
达 Fluency — The craft
- The Chinese must read naturally, not like translated text
- Reorder clauses into natural Chinese topic-comment structure
- Drop unnecessary English connectives (and, but, that, which)
- Break long English sentences into natural Chinese breath groups (意群), 7-15 characters each
- Use proper Chinese rhythm: alternate long and short sentences
- Active voice over passive: Chinese uses 被 far less than English uses passive. Prefer 由/受/让 or restructure into topic-comment
- Verb complements over adverbs: "walked slowly" → "走得很慢", not "慢慢地走"
雅 Cultural Adaptation — The art
- When English idioms, slang, cultural references, or metaphors cannot be directly translated, find Chinese equivalents that convey the same meaning and emotional impact
- Think about what a Chinese reader would understand, not what the English words literally say
- For cultural references unknown to Chinese readers, add brief inline explanation: (译注:...)
- For puns/wordplay that cannot be translated, translate the meaning and note the wordplay in translator's note
Native Chinese Quality Checklist
After translating, especially in Normal and Refined modes, self-review for these common "translation-ese" problems:
Europeanized Chinese (欧化中文) — The 6 Red Flags
- 过度使用"被"字句: "He was praised" → "他受到了表扬" (not "他被表扬了")
- 不必要的连接词堆砌: "因为...所以...", "虽然...但是...", "当...的时候" — Chinese often omits these when context is clear
- 定语堆叠过长: English long pre-modifiers → Split into multiple short clauses in Chinese
- "之一"泛滥: "one of the most..." → "极其..." / "...得很", not always "...之一"
- "的"字密度过高: If three or more 的 appear in one sentence, restructure
- 名词化泛滥: "the implementation of..." → "实施..." (verb), not "...的实施" (noun phrase)
Rhythm & Breath
- Read the Chinese aloud in your mind. Does it breathe naturally?
- Alternate sentence lengths. Three long sentences in a row → break one up
- Use four-character phrases (四字格) sparingly for rhythm, not ornamentation
- Chinese prose values 留白 (suggested space) — don't over-explain what the original leaves implied
Output Format
Chinese-only translation. Do NOT include the English original. The reader wants a clean Chinese reading experience.
Full book structure
# [Book Title] — 中文翻译
## 翻译说明
- 原文:[Book Title] by [Author]
- 翻译方式:逐句翻译([模式]模式,[风格]风格)
- 翻译原则:信(忠实原文)、达(中文流畅)、雅(文化适配)
---
## Chapter N: [Chapter Title]
### [Section heading if any]
中文翻译段落内容。
中文翻译段落内容。
---
*— 第 N 章完 —*
- Preserve all chapter and section structure from the original PDF
- Skip PDF page numbers and running headers
- Output Chinese only, no English original
- Add
---between chapters,*— 第 N 章完 —*at chapter end
Workflow
Step 0: Choose Mode & Style
If the user hasn't specified, auto-detect from their phrasing. For books, Normal mode is the default starting point. If the user's quality expectation is unclear, ask briefly: "用标准模式还是精翻模式?精翻模式会逐章审校润色,质量更高但耗时更长。"
Step 1: Pre-Translation Analysis
Quick mode: Skip analysis, translate directly.
Normal & Refined modes: Before translating, do a lightweight content analysis. Save as [book-title]-analysis.md:
## 内容概要
- 主题领域、核心论点
- 作者背景和写作立场
- 目标读者
## 术语提取
| 英文 | 中文 | 备注 |
|------|------|------|
| term | 翻译 | context |
## 语气与风格
- 正式/口语化?幽默/严肃?
- 叙事视角(第一人称/第三人称/全知?)
- 建议的翻译风格:[style preset]
## 翻译难点预警
- [具体段落/表达] → 难点类型(隐喻/文化梗/长难句/双关)→ 建议处理方式
For books, this analysis is done once for the entire book (scan first 10-20 pages + table of contents). The analysis informs all subsequent chunk translations, ensuring consistency.
Step 2: Read & Translate
Quick mode: Read PDF pages → Translate directly → Write to [filename]-chinese.md.
Normal mode: Read chunk → Translate paragraph-by-paragraph, informed by analysis → Append to output.
Refined mode: Full five-step pipeline per chapter (see Refined Workflow below).
Step 3: Chunking Strategy for Books
Books are translated chapter by chapter, with chapters further split if they exceed ~3000 English words.
For each chunk:
- Read the PDF pages using the Read tool
- Translate paragraph by paragraph, applying:
- The terminology table from Step 1 analysis (be consistent across all chunks)
- The chosen style preset
- All translation principles from this skill
- Self-check: Did every English sentence get translated? Does the Chinese read naturally?
- Write to the output file (Write for first chunk, Edit to append subsequent chunks)
- Report progress: "已翻译 第N章 (Px-Py),共约 Z 页"
Terminology consistency across chunks: Before translating each new chunk, review the terminology table from the analysis. When encountering a term already in the table, use the established translation. When encountering a new term, add it to the table.
Resuming interrupted work
- Read the existing output file and analysis file to find where translation stopped
- Check which pages/chapters remain
- Continue from the next un-translated page
Refined Mode: Full Five-Step Pipeline
For publication-quality output. Each step reads the previous step's output and builds on it. All intermediate files are saved.
Step R1: Analyze (same as Step 1 above)
Save to [book-title]-analysis.md
Step R2: Draft
Translate the full chapter, applying analysis findings. Save to [chapter]-draft.md. This is the raw translation — it will be refined.
Step R3: Critical Review
Review the draft against the original. Diagnosis only — no rewriting yet. Save to [chapter]-critique.md:
## 准确性
- [问题]: [位置] — [描述:增译/漏译/误译/术语不一致]
## 中文自然度(欧化中文检查)
- [问题]: [原译] → [建议改法]
## 文化适配
- [术语/隐喻]: [当前译法] → [建议调整及理由]
## 总结
[共发现 X 处准确性问题,Y 处表达问题]
Key review lens — flag any sentence that reads as "translated" rather than "written":
- Unnatural word order that mirrors English
- Stiff phrasing that a native Chinese writer would never produce
- Overuse of 被/的/之一/当...时/如果...那么
- Metaphors translated literally that sound foreign in Chinese
- Emotional tone flattened or shifted
Step R4: Revise
Apply all findings from the critique. Save to [chapter]-revision.md. Fix all accuracy issues, rewrite unnatural expressions, adjust notes, improve flow.
Step R5: Polish
Final pass for publication quality:
- Read the entire translation as a standalone piece — does it flow as native content?
- Smooth remaining rough transitions
- Ensure consistent narrative voice and style throughout
- Final terminology consistency check
- Save final to
[chapter]-chinese.md
Handling Special Content
Images & diagrams in PDF
- Note them in place:
[图片:描述] - After translation, if the PDF contains text-heavy images (diagrams, charts, screenshots), remind the user: "文中插图可能仍含英文原文,需要手动本地化。"
- Do not attempt to translate image text unless the user specifically asks
Footnotes & endnotes
- Translate footnote text but keep footnote numbers
- Preserve footnote placement (page bottom or chapter end)
Code, formulas, technical notation
- Keep exactly as-is — no translation
Tables
- Translate cell by cell
- Preserve table structure exactly
Dialogue
- Use 「」 quotation marks for dialogue in Chinese (consistent throughout)
- Add speech rhythm particles: 啊, 吧, 呢, 嘛 where natural
- Preserve character voice: a professor and a teenager must sound different in Chinese
Configuration (EXTEND.md)
Optional. Create .pdf-translator/EXTEND.md in the project root to set persistent preferences:
target_language: zh-CN
default_mode: normal # quick | normal | refined
style: storytelling # literal | storytelling | elegant | academic | conversational
audience: general # general | technical | academic | young-readers
chunk_max_words: 3000
glossary:
"term": "翻译"
"another term": "另一个翻译"
glossary_files:
- custom-glossary.md
If EXTEND.md is not found, ask once and save. If found, use it. If the user wants to change mid-session, they can just say so.
Example
Input (English PDF paragraph):
The old man had taught the boy to fish and the boy loved him. He was an old man who fished alone in a skiff in the Gulf Stream and he had gone eighty-four days now without taking a fish. In the first forty days a boy had been with him. But after forty days without a fish the boy's parents had told him that the old man was now definitely and finally salao, which is the worst form of unlucky.
Output (storytelling style):
老头儿教过那孩子打鱼,孩子也爱他。他是个独自在湾流里的一只小船上打鱼的老头儿,他如今已经接连八十四天一条鱼也没打着了。头四十天里,有个孩子跟他在一起。可是过了四十天一条鱼都没打到,孩子爹妈就跟他说,这老头儿如今是彻底"倒了血霉"(salao),意思就是倒霉到了极点。
Reference Files
references/translation-guide.md— Detailed EN→ZH sentence transformation patterns, domain-specific glossaries, dialogue handling. Read when dealing with complex passages.references/glossary-en-zh.md— Built-in English→Chinese terminology glossary for common terms with non-obvious translations. Consult when translating technical or specialized content.references/refined-workflow.md— Extended guidelines for the Refined mode five-step pipeline. Read when user selects Refined mode.
Quick Reference: Pre-Flight Checklist
Before delivering any translation, verify:
- Every English sentence has a corresponding Chinese sentence
- Numbers, dates, proper names match the original exactly
- No sentence reads as obvious "translation-ese" (被/的/之一 abuse)
- Paragraph structure matches the original
- Terminology is consistent (check against analysis/glossary)
- Chapter/section headings are translated and formatted correctly