noun[ C ]engineeringspecializeduk/ˈsprɒk.ɪt ˌwiːl/us/ˈsprɑː.kɪt ˌwiːl/(also sprocket wheel)
链轮;输片齿轮
a device like a wheel with one or more rows of tooth-like parts sticking out that keeps a chain moving on a bicycle or pulls film, paper, etc. through a machine