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In order to consider the effect of fiber orientation and non-uniform fiber length in the model , 1 and 2 should be modified .
 engineering feature: fiber orientation; concept or principle: fiber length; concept or principle: model; material: be
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: fiber orientation; concept or principle: fiber length; concept or principle: model; material: be