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This new ability to rapidly and heterogeneously integrate multiple functional materials in three-dimension at micro-scale has potential to accelerate advances in many emerging areas including 3D metamaterials , tissue engineering , and soft robotics .
 concept or principle: heterogeneously; material: multiple functional materials; concept or principle: three-dimension; concept or principle: micro-scale; process parameter: areas; material: 3D metamaterials; concept or principle: tissue engineering; application: soft robotics
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: heterogeneously, multiple functional materials, three-dimension, micro-scale, areas, 3D metamaterials, tissue engineering, soft robotics 
Answer:
 concept or principle: heterogeneously; material: multiple functional materials; concept or principle: three-dimension; concept or principle: micro-scale; process parameter: areas; material: 3D metamaterials; concept or principle: tissue engineering; application: soft robotics