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This article reviews the emerging research on WAAM techniques and the commonly used metallic feedstock materials , and also provides a comprehensive over view of the metallurgical and material properties of the deposited parts .
 concept or principle: research; manufacturing process: WAAM; material: metallic; material: feedstock materials; application: metallurgical; concept or principle: material properties
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: research; manufacturing process: WAAM; material: metallic; material: feedstock materials; application: metallurgical; concept or principle: material properties