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The economic and efficient new method is expected to solve the challenges faced by traditional WAAM such as excessive heat input and poor geometrical accuracy .
 manufacturing process: faced; manufacturing process: WAAM; material: as; concept or principle: heat; process characterization: accuracy
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: faced, WAAM, as, heat, accuracy 
Answer:
 manufacturing process: faced; manufacturing process: WAAM; material: as; concept or principle: heat; process characterization: accuracy