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The high melting points of ceramics make them difficult to melt under normal heating methods .
 machanical property: melting points; material: ceramics; concept or principle: melt; manufacturing process: heating
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:
 machanical property: melting points; material: ceramics; concept or principle: melt; manufacturing process: heating