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Key challenges and future directions in integrating the two technologies are as follows : i ) A comprehensive and reliable database containing detailed information on the mechanical and biological properties of human bones is yet to be established .
 concept or principle: technologies; material: as; enabling technology: database; application: mechanical; concept or principle: properties; material: be
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: technologies; material: as; enabling technology: database; application: mechanical; concept or principle: properties; material: be