Why are domestic cans different from foreign designs?

Let me add the answer of @ jingjing jingjing. This problem can be traced back to Coca-Cola Company. They began to use cans. This technical patent seems to belong to Coca-Cola Company, but the company has extended the patent to other countries for free, which actually includes most beverage cans in China. For example, Wang Laoji, Pepsi, drinks and cans under Pepsi are all like this; Pop cans and pull rings together can increase environmental protection; But separation also has advantages, that is, hygiene. There is no need to associate the tab with the beverage, because there is a strong sense of environmental protection abroad. You shouldn't wear shoes for a week in most European cities. The degree of ash in the air can be imagined, and the contact between the pull ring and the beverage will naturally not affect the user's experience. Only now they have a strong sense of environmental protection and are unwilling to use separation to destroy the environment, because conjoined ones are better than separated ones. As for China, there are still some enterprises that cannot be separated. This is their own problem. Every company's product department has its own ideas and can't guess;