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Personal phrase translation uses Google Translate on-device models through ML Kit, with attribution beside machine-derived results. The 200 bundled reviewed phrases are kept separate from automatic output.
ML Kit has one Chinese model. Traditional Chinese personal results are adapted using Apache-2.0 OpenCC dictionaries for Taiwan-oriented characters and vocabulary. This is dictionary conversion, not human review or the same output as iOS Translation. Back-translation starts from the model's pre-conversion Chinese result and may not reveal changes introduced by Taiwan-oriented conversion.
Japanese rewriting is offered only when its on-device feature is available; you review a suggestion before applying it.
Automatic translations can be incorrect and may not replace a human translator. Google does not warrant translation accuracy, reliability, merchantability, suitability for a specific purpose, or non-infringement. Read Google's original disclaimer and ML Kit translation terms.