There are historical reasons for saluting when celebrating or welcoming guests. According to literature, as early as 400 years ago, the British navy had the habit of firing guns to welcome guests. At that time, the guns on warships were all loaded from the muzzle, and it took a long time to load them every time they fired. Therefore, before a ship of one country sails into the harbor of another country, or meets a foreign ship on the high seas, in order to show no hostility, all the ammunition in the guns on the ship should be released before the ship stops or passes through the port. In the long run, firing guns has become an international practice of mutual respect. Later, this etiquette spread from the sea to the land. As a ceremony to celebrate and welcome guests, salute has also become an international etiquette practice to celebrate and welcome guests.