question: system:improve:implementation
choices.label: A B C D
choices.text: innovation:develop:promote regulations:completeness:implement copyright:protect:infringe food:safety:circulation
explanation: the "system" can be "improved". "system" can be "implemented", and the "implementation" needs to be "improved". "implementation" and "improvement" will occur in time order. "development" will not be "innovated". "regulations" will be "complete", "regulations" will be "implemented", and problems will be found in the process of "implementation", and it will take time for "completing" "regulations". "implementation" and "completion" will occur in time order. "copyright" can be "protected"."copyright" can be "infringed". "protection" and "copyright" will occur in no order. "food" must be "safe".
relation: improve system R4.2
relation: completeness regulations R4.2
relation: protect copyright R4.2
relation: copyright infringe R4.2
relation: food safety R4.3