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Material jetting for the production of metal parts is hampered by the high temperatures needed to get the metals in the proper liquid state .
 manufacturing process: Material jetting; manufacturing process: production; material: metal; process parameter: temperatures; material: metals; concept or principle: liquid state
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: Material jetting, production, metal, temperatures, metals, liquid state 
Answer:
 manufacturing process: Material jetting; manufacturing process: production; material: metal; process parameter: temperatures; material: metals; concept or principle: liquid state