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These two cases can be described very well by the two mechanisms in SLM , namely the temperature gradient mechanism ( TGM ) and the cool-down phase .
 be, SLM, temperature gradient mechanism, TGM, phase
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:
 be, SLM, temperature gradient mechanism, TGM, phase