Disclosed is a composition for preventing backflow of odor, produced by mixing a cyclic siloxane organic solvent or a hydrocarbon organic solvent with an aromatic oil that has oil extracted from the nature, wherein the cyclic siloxane organic solvent includes at least one of a cyclic siloxane tetramer, pentamer, or hexamer. Variations include two needles joined by a flow junction and one needle and a single cannula joined by a flow junction. The first angle is configured to cause a user standing on the at least one substantially planar surface of the ice-skating training system to shift their weight to a predetermined portion of a skate blade. If the data is written to each of said storage block sets, the access processing section writes the data only to non-defective blocks in said storage block set based on the record enabledisable information stored in said management information storage section. The compressed video data stream is then combined with the one or more VBI data type streams to produce the enhanced video data stream.