The invention relates to the new usage of puerarin in the field of pharmaceutical products, in other words, it relates to the application of puerarin in the preparation of drugs for P2X3 mediated painnervous system diseases. The interchangeable advertising media location is generally configured to receive an advertising media logo that may be quickly and easily removed and replaced with a different advertising media logo. The injector also includes a force generator assembly and a movable valve. The fluid flow barrier has dimensions sufficient to control the quantity of underfill egressing from the flow restricted region. , whose access frequency is high are updated by using the nonvolatile storing medium, the burden imposed on the nonvolatile storing medium can be reduced by using different areas. The reels are stopped in accordance with the determined outcome.