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In this paper , the authors explore the layer-to-layer sensitivity for both PZT sensors embedded into printed parts and for a fixture-based PZT sensor .
 process parameter: sensitivity; material: PZT; material: PZT
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: sensitivity, PZT, PZT 
Answer:
 process parameter: sensitivity; material: PZT; material: PZT