A small cogwheel that engages or is engaged by a larger cogwheel or a rack.
A small cogwheel that engages or is engaged by a larger cogwheel or a rack.
小齿轮，齿杆啮合大齿轮或被大齿轮或齿条啮合的小齿轮
A small cogwheel that engages or is engaged by a larger cogwheel or a rack.
小齿轮，齿杆啮合大齿轮或被大齿轮或齿条啮合的小齿轮