DualBook 8 languages

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Make a Chinese-Vietnamese bilingual book

Each Chinese paragraph with its Vietnamese translation directly beneath it, in one EPUB. Read the Chinese first; the Vietnamese is there for the sentence that will not resolve.

The first 15 pages of text are sent to our server to be translated. The file itself stays on your device.

This is the pair where a parallel text teaches fastest, because the two languages already share a vocabulary. Once you see that a particular character keeps corresponding to a particular Vietnamese syllable — and it does, regularly, across hundreds of words — you stop learning words and start learning the correspondence. A dictionary gives you one entry at a time; a parallel text gives you the pattern.

It also shows you where the pattern breaks. Some Sino-Vietnamese words froze with the meaning they had centuries ago while the Chinese moved on, and those are exactly the ones that catch a confident reader. Seeing the translation underneath is how you notice.

Your browser opens the EPUB, walks each paragraph and inserts the Vietnamese beneath it inside the original file, rewriting only the chapter documents that received a translation, so cover, navigation and metadata survive untouched.

How it works

  1. Choose a Chinese EPUB

    A DRM-free EPUB. The bilingual file is assembled in your browser, not on a server.

  2. The model reads the whole book

    The cast and their relative ages are mapped once, so the Vietnamese pronouns hold steady from chapter to chapter.

  3. Vietnamese is inserted under each paragraph

    Each translation is styled beneath its paragraph, easy to tell apart at a glance.

  4. Read it here, or on your phone

    A complete EPUB carrying the book's own fonts and stylesheets, so CJK text displays as the book intended.

The trap, and the honest limits

Your eye will go to the Vietnamese. Read the Chinese paragraph first, every time — and with this pair there is a second trap: the vocabulary is familiar enough that you will think you understood a sentence you actually guessed at. The translation underneath is how you check.

Fifteen pages get translations. The rest of the book stays in Chinese inside the same file.

The text is sent to a server and discarded when the job ends. The file never leaves your device.

Questions

Which side should I read first?

Chinese first, every paragraph — then check. The shared vocabulary makes it unusually easy to feel you understood a sentence you only half-recognised.

Why is this pair especially good for parallel reading?

Because the two languages share a large, systematic layer of vocabulary. Reading them stacked reveals the sound correspondences between Chinese characters and Sino-Vietnamese syllables, and those repeat — so vocabulary comes in blocks rather than one word at a time.

Does it work with traditional characters?

Yes, both simplified and traditional. The script does not change how the text is read or how the file is rebuilt.

Will it open on a Kindle?

Yes. Kindle has accepted EPUB directly since 2022 and renders both Chinese and Vietnamese; email the file to your device or copy it across.

The whole book, in parallel

The app builds the bilingual version of the entire book, with tap-to-look-up and your reading position synced across devices.

Open DualBook