2063
However , the modelling and function validation of such surface structure has not yet been studied .
 enabling technology: modelling; concept or principle: validation; engineering feature: surface structure
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:
 enabling technology: modelling; concept or principle: validation; engineering feature: surface structure