233
The pure copper alloy joined the MMC part and the pure glass phase penetrated into the CMC part during laser processing , which anchored the glass phase , as the main mechanism of combining pure metal and pure glass by FGM in 3D printed parts .
 copper alloy, MMC, glass, CMC, laser processing, glass, as, mechanism, pure metal, glass, FGM, 3D printed parts
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 copper alloy, MMC, glass, CMC, laser processing, glass, as, mechanism, pure metal, glass, FGM, 3D printed parts