property: { A_id, name } relation:
property: { cf_id, name } relation: (CF)-[belong:]->(A)
property: { course_id, title } relation: (C)-[mention:weight]->(CF) (C)-[teach_by]->(T)
property: { teacher_id, tname } relation: (T)-[:expertise]->(CF)
https://www.slideshare.net/leezhenyu/coscup-2016-workshop-neo4j