The meaning and use of teeth
The teeth in the gear are arranged in a tooth shape, and they work together to make the gear rotate normally. The teeth in the gear are similar to the "teeth" of the organs that chew food in human and animal mouths.
The meaning and use of wheels
A wheel is something that can turn on a machine and make it run, such as a gear. At the same time, a wheel can also refer to a round object similar to a wheel, such as sun gear and Moon Wheel.