Please translate an English joke (very simple)

With the popularity of Chinese, many foreigners began to learn Chinese. Of course, they made a funny mistake. Today I will tell you such a story.

When he met "Hello", when he came home, he saw a beautiful China girl standing on the stool. He wanted to say hello to her and suddenly forgot how to say "Hello". It took me a long time to remember. They said, "Hello, your mother." The girl didn't read him. The man found that he was wrong and said "Hello, Mom" instead.