【正确答案】The sliver must be reduced to an almost singlefiber stream before it is caught up in the open end of the yarn. The combing roller separates the feeding sliver to individual fibers. A high- speed air stream is used to remove the fibers from the combing roller and transport them through a delivery tube to the rotor. The drafted fiber is deposited as a very thin continuous stream into a collecting groove inside the rotating rotor. With each revolution of the rotor, additional fibers build up and twists are added to the assembled fibers at a rate of about one turn of twist per revolution. Then, the resultant yarn output from rotor is wound into a package by delivery rollers.