Chen Ji focused on improving localization quality in the mdn/translated-content repository, addressing a critical mistranslation in the Chinese version of the "How the Internet Works" article. By correcting the translation of "Router" and clarifying distinctions between Layer 2 and Layer 3 networking concepts, Chen Ji enhanced the technical accuracy and beginner accessibility of the documentation. The work involved technical writing, translation, and networking expertise, with changes documented in Markdown to ensure traceability and future maintainability. This targeted bug fix reduced potential confusion for readers, supported content trust, and contributed to ongoing quality assurance efforts within the open-source documentation project.