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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 .
 heterogeneously, multiple functional materials, three-dimension, micro-scale, areas, 3D metamaterials, tissue engineering, soft robotics
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 heterogeneously, multiple functional materials, three-dimension, micro-scale, areas, 3D metamaterials, tissue engineering, soft robotics