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Experimental results show that the layer-by-layer trajectory optimization strategy applied to parts of revolution provides better geometrical accuracy while improving the efficiency of the manufacturing device compared to non-optimized solutions .
 concept or principle: Experimental; concept or principle: layer-by-layer; concept or principle: optimization; process characterization: accuracy; manufacturing process: manufacturing
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: Experimental; concept or principle: layer-by-layer; concept or principle: optimization; process characterization: accuracy; manufacturing process: manufacturing