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Alternatively , a bio-inspiration approach can be employed to alter specific properties of the natural structure resulting in an optimal design .
 concept or principle: bio-inspiration; material: be; machanical property: specific properties; concept or principle: structure; engineering feature: design
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: bio-inspiration; material: be; machanical property: specific properties; concept or principle: structure; engineering feature: design