A straw includes a straw body, an air return flap and a retaining ring, both the air return flap and the retaining ring are provided on the straw body, and the retaining ring is located above the air return flap and spaced apart from the air return flap. The system can output a video frame and an audio frame at the same time, within a prediction of video frame unit or audio frame unit, when starting reproduction of compressively coded data from an entry point. Connecting leads extending from the power-switching element are positioned at an upper portion of the sloped surface which is close to the circuit board. In one embodiment, the core may comprise a depressed index center portion and surrounding ring core area, with the center portion including the aluminum doping and the ring formed to have a diameter less that the phonon decay length for the operating wavelength. Wheel chocks integral to the base localizes the vehicle wheel assembly, substantially aligning the vehicle axle with the cylindrical blocking member coaxially.