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Laser powder bed fusion ( LPBF ) has broad application prospects due to its high fabrication accuracy and excellent performance , but the dynamic mechanical properties of LPBF components are relatively low due to defects of the melt track such as protrusions and depressions , whose generation mechanisms remain unclear .
 manufacturing process: Laser powder bed fusion; manufacturing process: LPBF; manufacturing process: fabrication; process characterization: accuracy; concept or principle: performance; concept or principle: dynamic; concept or principle: properties; manufacturing process: LPBF; machine or equipment: components; concept or principle: defects; concept or principle: melt; material: as
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: Laser powder bed fusion, LPBF, fabrication, accuracy, performance, dynamic, properties, LPBF, components, defects, melt, as 
Answer:
 manufacturing process: Laser powder bed fusion; manufacturing process: LPBF; manufacturing process: fabrication; process characterization: accuracy; concept or principle: performance; concept or principle: dynamic; concept or principle: properties; manufacturing process: LPBF; machine or equipment: components; concept or principle: defects; concept or principle: melt; material: as