A wheel is a circular object that forms a part of a machine, usually a moving part.
机轮 • The wheels are usually fairly large. 该机轮通常相当大。
If you wheel an object that has wheels somewhere, you push it along.
推 (带轮子的物体) • He wheeled his bike into the alley at the side of the house. 他把自行车推进了房屋一侧的胡同里。