I sometimes work with technical notes that switch between English and Chinese mid-sentence: the explanation is in one language, while product names, error messages, or code comments stay in the other.

Has anyone tested DeepSeek on this kind of mixed-language material? I’m curious whether it preserves the original terminology when summarizing or translating, and whether performance changes when most of the document is in one language but the key details are in another.

A concrete example from documentation, bug reports, or developer discussions would be useful.