1540
Steels are important engineering material invented by mankind because of their extreme multiplicity in operties .
 material: Steels; material: engineering material
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: Steels; material: engineering material