1798
These are also critical tools in final steps of topology optimization and even true biomimetic reverse engineering structures , ultimately allowing for watertight models with curved geometries .
 machine or equipment: tools; engineering feature: topology optimization; concept or principle: biomimetic; application: engineering; concept or principle: watertight models; concept or principle: geometries
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:
 machine or equipment: tools; engineering feature: topology optimization; concept or principle: biomimetic; application: engineering; concept or principle: watertight models; concept or principle: geometries