Before revision: Unlike large-scale energy generation reliant on resources like oil or coal, nanogenerators utilize ambient background energy readily available in the environment, such as temperature gradients from machinery operation, electromagnetic energy in urban areas, or even motion vibrations during activities like walking.
After revision: Nanogenerators utilize ambient background energy readily available in the environment, such as temperature gradients from machinery operation, electromagnetic energy in urban areas, or even motion vibrations during activities like walking.