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Biomimetic design has also been named as it has been suggested that these approaches may lead to the use of the minimum required materials , which is most environmentally sustainable .
 engineering feature: Biomimetic design; material: as; material: lead; concept or principle: materials; 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: Biomimetic design; material: as; material: lead; concept or principle: materials; concept or principle: sustainable