In the fifth paragraph, the author portrayed the little blue bird as an extremely light object that seemed to be able to fly in the air through the description of "throwing it on the street like a stone". This description implied that the little blue bird was extremely fast and could fly at high speed in the air, which was consistent with the description of "lightness" in the previous article. Therefore, through this description, we can feel that the speed of the little blue bird is very fast, like a stone thrown on the street. It seems to be able to fly at high speed in the air, showing a very amazing strength and speed.