2024
5 Tools and methods for optimizing surface structure As discussed above , the global optimal for structure design is usually hard to obtain .
 machine or equipment: Tools; engineering feature: surface structure; material: As; engineering feature: structure design
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: surface structure; material: As; engineering feature: structure design