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Besides broad design categories or guidelines , the use of X-ray tomography to study intricate details of individual biological structures in 3D for biomimetic applications is also a promising strategy to learn from nature .
 engineering feature: design; process characterization: X-ray tomography; engineering feature: biological structures; concept or principle: 3D; application: biomimetic applications
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:
 engineering feature: design; process characterization: X-ray tomography; engineering feature: biological structures; concept or principle: 3D; application: biomimetic applications