9389
At present , several studies have focused on hybrid manufacturing and enhancing the mechanical properties of Ti-6Al-4V with additive manufacturing techniques .
 concept or principle: hybrid manufacturing; concept or principle: mechanical properties; material: Ti-6Al-4V; manufacturing process: additive manufacturing
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: hybrid manufacturing, mechanical properties, Ti-6Al-4V, additive manufacturing 
Answer:
 concept or principle: hybrid manufacturing; concept or principle: mechanical properties; material: Ti-6Al-4V; manufacturing process: additive manufacturing