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Additionally , the grain morphology boundaries are similar to curves of constant melt pool aspect ratio .
 concept or principle: grain; engineering feature: boundaries; material: melt pool; engineering feature: aspect ratio
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: grain, boundaries, melt pool, aspect ratio 
Answer:
 concept or principle: grain; engineering feature: boundaries; material: melt pool; engineering feature: aspect ratio