9224
Surfaces polished before shot-peening or following removal of about 25–30 μm from the surface after shot-peening by either mechanical or electrolytic polishing showed improved fatigue resistance and fatigue limit .
 concept or principle: Surfaces; concept or principle: surface; application: mechanical; manufacturing process: polishing; machanical property: fatigue; machanical property: fatigue
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: Surfaces, surface, mechanical, polishing, fatigue, fatigue 
Answer:
 concept or principle: Surfaces; concept or principle: surface; application: mechanical; manufacturing process: polishing; machanical property: fatigue; machanical property: fatigue