1683
Learning from these biological structures may advance our use of efficient structures in engineering applications and may even help to provide new solutions to engineering problems , in a sustainable way .
 engineering feature: biological structures; application: engineering; application: engineering; concept or principle: sustainable
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:
 engineering feature: biological structures; application: engineering; application: engineering; concept or principle: sustainable