2970
It is concluded that channel orientation plays a prominent role in determining the surface roughness of aB-fabricated interior channels , and a lower laser energy density results in the highest reduction in surface roughness after an electropolishing treatment .
 application: channel; machanical property: surface roughness; process parameter: laser energy density; concept or principle: reduction; machanical property: surface roughness; manufacturing process: electropolishing
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: channel, surface roughness, laser energy density, reduction, surface roughness, electropolishing 
Answer:
 application: channel; machanical property: surface roughness; process parameter: laser energy density; concept or principle: reduction; machanical property: surface roughness; manufacturing process: electropolishing