Take out a pack of chewing gum and gently pinch the outer wrapping paper. If the adhesion of the package opens at once, it is fake. Because Zhenyida is sealed with wax, no matter how hard it is, even if the package and the chewing gum inside are pinched and deformed, it can't be opened, and the opening line at the other end of the package must be pulled to open it. The fake Yida is sticky, so it is easy to talk.