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Our results indicate that nature-inspired microstructural designs towards directional properties can be realized in structural components using a novel additive manufacturing approach .
 concept or principle: microstructural; engineering feature: designs; concept or principle: properties; material: be; concept or principle: structural components; manufacturing process: additive manufacturing
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: microstructural, designs, properties, be, structural components, additive manufacturing 
Answer:
 concept or principle: microstructural; engineering feature: designs; concept or principle: properties; material: be; concept or principle: structural components; manufacturing process: additive manufacturing