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The evolution of mechanical properties such as hardness and microstructure was analyzed .
 concept or principle: evolution; concept or principle: mechanical properties; material: as; concept or principle: microstructure
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: evolution, mechanical properties, as, microstructure 
Answer:
 concept or principle: evolution; concept or principle: mechanical properties; material: as; concept or principle: microstructure