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In addition to alloying , amorphous structures like metallic glass alloys MgZnCa showed low degradation rate and high strength .
 engineering feature: alloying; concept or principle: amorphous structures; material: metallic glass alloys MgZnCa; process characterization: degradation rate; machanical property: strength
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: alloying; concept or principle: amorphous structures; material: metallic glass alloys MgZnCa; process characterization: degradation rate; machanical property: strength