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Functionally Graded Materials are defined as a class of advanced materials characterised by spatial variation in material composition across the volume , contributing to corresponding changes in material properties in line with the functional requirements .
 material: Functionally Graded Materials; material: as; material: class of advanced materials; engineering feature: spatial variation; material: material; concept or principle: composition; concept or principle: volume; concept or principle: material properties
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:
 material: Functionally Graded Materials; material: as; material: class of advanced materials; engineering feature: spatial variation; material: material; concept or principle: composition; concept or principle: volume; concept or principle: material properties