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The technique developed in this work provides a feasible route to additively construct single-channel multilayer structures with spatial distributions of the composition and microstructures .
 process characterization: spatial distributions; concept or principle: composition; material: microstructures
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: spatial distributions, composition, microstructures 
Answer:
 process characterization: spatial distributions; concept or principle: composition; material: microstructures