Riding on a bicycle should be a very simple thing, but it is extremely difficult for me. When I was a child, I could ride the four-wheel and three-wheel bicycle very well, and I liked to ride around in my neighborhood. I felt myself was as cool as the police riding on his motorcycle. 

However, I cannot ride the bicycle anymore that I rode when I grew up. I started to learn how to ride the two-wheel bicycle, and it is much more difficult than I expected. This kind of bicycle is totally different from what I used to ride, it has no balance at all. Someone told me that you can get balance when you’re riding. So I was trying to pedal and let the bicycle move forward, and it was quite smooth at first, I even could felt the breeze touch my face gently. But, this condition did not last longer than one minute, I felt that I was just like a clown performing acrobatics when the bicycle started to shake left and right. I was too scared to continue pedaling, then the bicycle started to tilt to one side until it touched the ground. Then I was sitting on the cement floor with a scrape on my knee. 

The end of this story is I will never ride any bicycles again, even if it is more than two-wheels.