652
4.3 Biodegradable metals Biodegradable materials , including both polymer-based and metal-based ones , are used for some medical implants which will gradually degrade in human body over a period of time .
 material: Biodegradable metals; machanical property: Biodegradable materials; application: medical implants
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:
 material: Biodegradable metals; machanical property: Biodegradable materials; application: medical implants