There are many number one in this world.
For example, the best swordsman in the world, the best swordsman in the world, the best thief in the world, the best restaurant in the world, etc., Etc. Therefore, it is not surprising that he is number one in the world.
The plaque of Yuehua City fell and killed ten people, nine of whom were the best in the world. There is another one who is retired and number one in the world.
Yuehua City, the best gold-selling cave in the world.