6474
Slow-speed scanning achieved a longer retention time of the liquid molten pool , which was beneficial to pore suppression .
 scanning, molten pool, pore
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:
 scanning, molten pool, pore