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This study demonstrates three main types of defects in Mo : ( 1 ) small spherical pores ; ( 2 ) inverted pear-shaped pores ; and ( 3 ) cavities .
 concept or principle: defects; material: Mo; concept or principle: spherical; machanical property: pores; machanical property: pores
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:
 concept or principle: defects; material: Mo; concept or principle: spherical; machanical property: pores; machanical property: pores