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The resulting surface finish uniformity of additive manufactured internal channels ( such as fuel transfer lines and cooling passages ) is an issue .
 engineering feature: surface finish; manufacturing process: additive manufactured; material: as; concept or principle: transfer lines; manufacturing process: cooling
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:
 engineering feature: surface finish; manufacturing process: additive manufactured; material: as; concept or principle: transfer lines; manufacturing process: cooling