framework knowledge expression
knowledge discovery
数据库知识发现
知识发现
知识发掘
数据挖掘
知识获取
知识挖掘
knowledge discovery from databases
knowledge discovery in data
knowledge discovery in database
knowledge discovery in databases—KDD
Open knowledge discovery
sugarcane harvester knowledge discovery system
a treasure of knowledge
accumulation of knowledge
acquirement and improvement of knowledge
acquiring knowledge thoroughly