The term "complete coverage" generally refers to the concept where a particular aspect, feature, or service is thoroughly taken care of, encompassing its entirety without any gaps or missing parts. In the context of "business English cultural input," if you are referring to a situation where cultural input is provided comprehensively, this could be translated as:
"Comprehensive Cultural Input in Business English"
This suggests that the cultural education or information being provided is all-encompassing, covering all necessary elements or aspects of culture that are relevant to conducting business in English.
However, if by "complete coverage" you mean that business English materials are entirely replacing or overshadowing the cultural components traditionally studied separately, the phrase would not be a standard academic or