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The weak-bonding defects are related to the oxides and impurities existing at the original bonding interfaces as well as the insufficient stirring action of the tool pin .
 concept or principle: defects; material: oxides; machanical property: impurities; concept or principle: bonding; material: as; material: as; machine or equipment: tool
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: oxides; machanical property: impurities; concept or principle: bonding; material: as; material: as; machine or equipment: tool