This study is a systematic review. The research searched Google Scholar from 2013 to 2025, etc. The search terms included "English textbooks/Cultural Presentation /Cortazzi The inconsistent conclusions on the proportion of local and target cultures in different versions are mostly related to the differences in samples and perspectives. The contribution of this paper lies in: taking Cortazzi & Jin as the main axis, integrating ICC, concentric circles, Hofstede, and Big C/Small c for integrated comparison, and proposing an operational improvement idea of "proportion - advancement - context". Practical significance: It provides key points for quota and hierarchical design for textbook compilers, offers suggestions for localized supplementary and comparative tasks for teachers, and points policy makers towards implementable evaluation indicators and resource allocation
Ruxin Wang (Fri,) studied this question.