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Benefits of this methods include good efficiency of material usage , parts with complicated shapes can be built , high strength material can be achieved , materials can be customized , it takes less time and it eliminated oxide impurities due to vacuum environment .
 material: material; material: be; machanical property: strength; material: material; material: be; concept or principle: materials; material: be; machanical property: oxide impurities
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:
 material: material; material: be; machanical property: strength; material: material; material: be; concept or principle: materials; material: be; machanical property: oxide impurities