The problem you mentioned is mainly about the naming and numbering of typhoons. The naming, definition, classification methods and determination of the center position of tropical cyclones vary from country to country and from different methods. Even in the same country, they are not exactly the same between different meteorological stations. Therefore, various misunderstandings often occur, resulting in confusion in use. In order to change this situation, the meteorological department adopted the method of naming typhoons. At the end of World War II, the United States first determined four groups of girl names starting with English letters (except Q, U, X, Y, and Z) to name Atlantic hurricanes. Each group is ordered alphabetically. Such as the first group: Anna (Anna), B1anche (Blanche), Camil.te (Camille), etc., until wcnda (Wenda); the second group: A1nla (Alma), Becl (J/(Becky) ), Cella (Celia), etc., until wilna (Wilna); the third group and the fourth group are also named from A to w. When the aircraft detects the typhoon, it will be named according to the order of occurrence, with the first one being named. That is, it is named Anna, and the second one is named B1anche... etc. When the first group of names is used up, the first name headed by A in the second group is used. The names following the last typhoon of the previous year are used in a circular manner. The total number of typhoons in any one region in a year cannot exceed the total number of these four groups of names. Take the Northwest Pacific, which has the most typhoons in the world. There should be no more than 50 in a year. Therefore, there cannot be duplicate names in each area in the same year. Of course, the names of typhoons will appear repeatedly in different years. Therefore, they must be marked in front of them. Year, to show the difference. my country has adopted the force and method of numbering typhoons since 1959. Whenever a typhoon forms or invades in the Pacific and South China Sea areas west of 150 degrees east longitude and north of the equator, the order of its occurrence will be used. , numbered in sequence. For example, the first typhoon in 1999 was numbered as 9901, the second typhoon was numbered as 9902... and so on. This method of numbering typhoons has been adopted by many countries. Some countries also indicate the English name of the typhoon in addition to the number, taking into account the long-standing international practice of using English names for typhoons.