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An improvement in the mechanical strength of the SiC-added WAAM parts was observed , which was attributed to the refined grain structure and finely dispersed Fe3C .
 machanical property: mechanical strength; manufacturing process: WAAM; concept or principle: grain structure
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: mechanical strength, WAAM, grain structure 
Answer:
 machanical property: mechanical strength; manufacturing process: WAAM; concept or principle: grain structure