4439
An important feature of small-size droplets ( as low as 0.89 mm ) offered CC-WAAM a great potential to improve the precision of the additive manufacturing layers , although the minimum width of the deposited layer is much larger than the droplet diameter due to liquid spreading and accumulation .
 engineering feature: feature; concept or principle: droplets; material: as; material: as; manufacturing process: mm; process characterization: precision; manufacturing process: additive manufacturing; process characterization: deposited layer; concept or principle: droplet; concept or principle: diameter
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: feature, droplets, as, as, mm, precision, additive manufacturing, deposited layer, droplet, diameter 
Answer:
 engineering feature: feature; concept or principle: droplets; material: as; material: as; manufacturing process: mm; process characterization: precision; manufacturing process: additive manufacturing; process characterization: deposited layer; concept or principle: droplet; concept or principle: diameter