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As the layer number increases , the length and width of molten pool and the width of deposited bead increase , whilst the layer height decreases .
 material: As; process parameter: layer; concept or principle: molten pool; process characterization: deposited bead; process parameter: layer height
Please list all entity words in the text that fit the category.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} 
Answer:
 material: As; process parameter: layer; concept or principle: molten pool; process characterization: deposited bead; process parameter: layer height