959
The resulting material may have different directional mechanical properties because of factors including different penetration properties and bonding strength and also preheating and post-heating effects of successive layers .
 material: material; concept or principle: mechanical properties; concept or principle: penetration; machanical property: bonding strength; manufacturing process: preheating
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: material; concept or principle: mechanical properties; concept or principle: penetration; machanical property: bonding strength; manufacturing process: preheating