用户层、服务层、知识发现层、资源层组成[4]的翻译：User layer, service layer, knowledge discovery, resource layers composition [4] 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

User layer, service layer, the layer of knowledge discovery, resource layer [4]

User layer, service layer, knowledge discovery, resource layers composition [4]

The user level, the service level, the knowledge discovered the level, the resources level compose [4)

User level, service level, knowledge discovery, resource-layer composition [ 4]

User layer, service layer, knowledge discovery, resource layers composition [4]