8839
The effect of the unit cell size on mechanical properties was studied and discussed , and the rankings of better performances were drawn .
 concept or principle: unit cell; concept or principle: mechanical properties
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: unit cell, mechanical properties 
Answer:
 concept or principle: unit cell; concept or principle: mechanical properties