An allusion refers to the name of a historical event, character, cultural phenomenon, or related plot. It is usually used in novels, movies, television dramas, and other literary works to better reflect the character image, plot background, and so on. The formation of allusions was usually due to a historical event or cultural phenomenon being widely praised by later generations and given a new meaning. Therefore, the composition of allusions needed to have a certain historical background and cultural significance, as well as a certain degree of representation and authority. Although any historical story could also become an allusion, it needed to have a certain historical background and cultural significance, and it needed to be widely praised and quoted by future generations to become an allusion. If a story did not have a historical or cultural background, or if it was not quoted and praised by later generations, then it could not be considered a true allusion.