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For the first time , microwave ( MW ) sintering is successfully used for densification of the green parts with centimeter-scale dimensions in which the primary chemical composition of the Mg-Zn-Zr powder is retrieved from the green parts , resulting in a compositionally zero-sum AM process .
 enabling technology: microwave; concept or principle: MW; manufacturing process: sintering; manufacturing process: densification; machanical property: green parts; concept or principle: centimeter-scale dimensions; concept or principle: chemical composition; material: Mg-Zn-Zr powder; machanical property: green parts; manufacturing process: AM process
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: microwave, MW, sintering, densification, green parts, centimeter-scale dimensions, chemical composition, Mg-Zn-Zr powder, green parts, AM process 
Answer:
 enabling technology: microwave; concept or principle: MW; manufacturing process: sintering; manufacturing process: densification; machanical property: green parts; concept or principle: centimeter-scale dimensions; concept or principle: chemical composition; material: Mg-Zn-Zr powder; machanical property: green parts; manufacturing process: AM process