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In the area of cellular or lattice structure design , some engineers refer to all porous engineered structures as biomimetic simply due to their resemblance to natural porous materials , or their similarity to the biological equivalent .
 process parameter: area; engineering feature: lattice structure design; machanical property: porous; material: as; material: porous materials; concept or principle: biological equivalent
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:
 process parameter: area; engineering feature: lattice structure design; machanical property: porous; material: as; material: porous materials; concept or principle: biological equivalent