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To date , much still needs to be understood regarding the microstructure evolution during DED .
 material: be; concept or principle: microstructure evolution; manufacturing process: DED
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: be, microstructure evolution, DED 
Answer:
 material: be; concept or principle: microstructure evolution; manufacturing process: DED