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These materials , contain either alumina-toughened zirconia or zirconia-toughened alumina , depending on the percentage of the main component .
 concept or principle: materials; material: alumina-toughened zirconia; material: alumina; machine or equipment: component
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:
 concept or principle: materials; material: alumina-toughened zirconia; material: alumina; machine or equipment: component