2132
Homogeneous FGM composition creates porosity or density gradients by modulating the spatial microstructure or morphology of lattice structures across the volume of material through a voxel approach .
 machanical property: Homogeneous FGM composition; machanical property: porosity; machanical property: density gradients; engineering feature: spatial microstructure; concept or principle: morphology; engineering feature: lattice structures; concept or principle: volume; material: material; concept or principle: voxel
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:
 machanical property: Homogeneous FGM composition; machanical property: porosity; machanical property: density gradients; engineering feature: spatial microstructure; concept or principle: morphology; engineering feature: lattice structures; concept or principle: volume; material: material; concept or principle: voxel