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Lightweight design is an area of mechanical engineering that becomes increasingly important in many industries , as they pursue reduced mass and more efficient parts .
 concept or principle: Lightweight; engineering feature: design; process parameter: area; application: mechanical engineering; application: industries; 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: Lightweight, design, area, mechanical engineering, industries, as 
Answer:
 concept or principle: Lightweight; engineering feature: design; process parameter: area; application: mechanical engineering; application: industries; material: as