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On the other hand , 3D data from the physical model is not at all straightforward and it requires data acquisition through a method known as a reverse engineering .
 concept or principle: 3D data; concept or principle: physical model; process characterization: data acquisition; material: as; concept or principle: reverse engineering
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: 3D data; concept or principle: physical model; process characterization: data acquisition; material: as; concept or principle: reverse engineering