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The virtual model created by a CAD software can be either a surface or a solid model .
 enabling technology: virtual model; enabling technology: CAD; material: be; concept or principle: surface; concept or principle: solid model
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: virtual model; enabling technology: CAD; material: be; concept or principle: surface; concept or principle: solid model