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Generally , numerical examples in TO involve either cantilever , half MBB or full MBB beams , but there is no explicit agreement by the scientific community on their aspect ratio , making comparisons difficult .
 engineering feature: cantilever; engineering feature: half MBB; engineering feature: MBB beams; engineering feature: aspect ratio
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: cantilever; engineering feature: half MBB; engineering feature: MBB beams; engineering feature: aspect ratio