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The authors claim that the precise control over spatially grade composition , microstructure design/distribution and shape are potential advantages over milling of unsintered ceramics .
 concept or principle: precise control; engineering feature: spatially grade composition; concept or principle: microstructure; manufacturing process: milling; machanical property: unsintered; material: ceramics
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: precise control; engineering feature: spatially grade composition; concept or principle: microstructure; manufacturing process: milling; machanical property: unsintered; material: ceramics