Re: How to speak two languages in the same sentence
For this you would need a TTS engine and voice that can read two languages at once. I don't think too many (if any at all) such voices exist. Maybe if you are using a Chinese TTS voice, it will be able to read aloud an occasional English word or phrase (with Chinese accent). English TTS voices will just ignore non-Latin characters. Maybe in the future there will be more multi-language voices... Of course, it won't be me, who creates them, but big teams of linguistic and programming experts.