Ghosts can't get into a house with a national flag.

The saying that ghosts can't bring the national flag into the house comes from a traditional custom in China folk culture. People think that planting the national flag at home can ward off evil spirits and protect the safety of their families. Planting the national flag is a symbolic act of patriotism, and it also has a certain symbolic significance.

In China, when people hold important festivals or anniversaries at home, they plant national flags to show their love and respect for the country. According to the traditional custom, while planting the national flag, the ghosts and gods in the family are also driven away to protect the family from evil spirits. This practice is generally considered as a blessing to protect the family among the people.

However, it should be noted that this statement is superstitious and there is no scientific basis to prove that inserting the national flag can prevent ghosts or evil spirits from entering. Modern society advocates science and rational thinking, and we should take scientific concept as the benchmark. There is no conclusive evidence to support the existence of supernatural phenomena such as ghosts.

So from a scientific point of view, planting a national flag at home can't stop ghosts from entering. If you have doubts about family safety, I suggest you take some practical and effective safety measures, such as installing anti-theft doors and windows and using safe electrical equipment to ensure family safety. At the same time, if you have any other questions about folk culture or family traditions, I will be happy to answer them for you.