4325
The aircraft engine industry manufactures many ring-like metal parts of large diameter but small crosB-sectional area .
 industry, metal, diameter, area
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 industry, metal, diameter, area