Each country has its national flag (国旗). Usually there is a story behind each national flag. The national flag of the United Kingdom has an interesting story, too. Do you want to know the interesting story? Just read on.
The UK has four parts. They are England, Wales, Scotland, and Northern Ireland. The four parts have their own flags and the flags are all different.
When Wales became part of England in 1542, the flag of England was the one used. Nothing was changed (改变). However, in 1603, when Scotland joined England to form (组成) a new country, the two national flags were put together to form a new flag. The last member, Ireland, joined the kingdom in 1801. In that year, the new flag appeared. That is the flag we see today. In 1992, however, parts of Ireland left the kingdom to become a new country. It also started to use its own flag.