Translate English PDF books into natural Chinese with three quality modes. Preserves original meaning sentence-by-sentence while producing fluent Chinese prose. Use this skill whenever the user wants to translate a PDF book, convert English books to Chinese, localize English content into Chinese, or mentions "翻译", "汉化", "英译中", "PDF翻译", "精翻", "速译" in the context of PDF or document translation. Also triggers for "translate this book", "帮我翻译这本", "汉化这个PDF", or any task where English PDF content needs to become natural Chinese text.
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Translate English PDF books into natural Chinese with three quality modes. Preserves original meaning sentence-by-sentence while producing fluent Chinese prose. Use this skill whenever the user wants to translate a PDF book, convert English books to Chinese, localize English content into Chinese, or mentions "翻译", "汉化", "英译中", "PDF翻译", "精翻", "速译" in the context of PDF or document translation. Also triggers for "translate this book", "帮我翻译这本", "汉化这个PDF", or any task where English PDF content needs to become natural Chinese text.
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
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.
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:
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:
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:
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.
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
