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3D characterization reveals complex grain morphologies and large orientation gradients , in excess of 10∘ , that are not easily interpreted from 2D crosB-sections alone .
 concept or principle: 3D; concept or principle: grain; concept or principle: orientation; concept or principle: 2D
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; concept or principle: grain; concept or principle: orientation; concept or principle: 2D