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In the 3D tomography dark-field volume of a tensile stressed bar , features were observed that suggested possible sites of crack formation .
 concept or principle: 3D; concept or principle: volume; machanical property: tensile
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: 3D, volume, tensile 
Answer:
 concept or principle: 3D; concept or principle: volume; machanical property: tensile