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The rapid development of additive manufacturing technology makes it possible to fabricate parts with complex inner structures , especially for functionally graded scaffolds ( FGS ) in the field of bone tissue engineering .
 manufacturing process: additive manufacturing; manufacturing process: fabricate; concept or principle: functionally graded; biomedical: bone; application: engineering
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: additive manufacturing, fabricate, functionally graded, bone, engineering 
Answer:
 manufacturing process: additive manufacturing; manufacturing process: fabricate; concept or principle: functionally graded; biomedical: bone; application: engineering