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However , these methods have difficulties in precisely controlling the porous structures of NiTi , i.e. , pore size and pore shape .
 machanical property: porous; material: NiTi; process parameter: pore size; machanical property: pore
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:
 machanical property: porous; material: NiTi; process parameter: pore size; machanical property: pore