Why can't the dragonfly be caught?

One summer vacation when I was in junior high school, there were rumors that dragonflies were collected everywhere in my hometown. It should have been two yuan at that time. Many people were so excited that the whole family sent out to form a arresting brigade. They say dragonflies are used for cosmetics. I don't know if it's true or not. At that time, an uncle in the village talked about where people earned two or three hundred dollars by catching dragonflies in one night, which made many people envious.

Our neighbor's uncle and brother also want to try it. After all, dragonflies don't need any cost, and they can be realized when caught. Later, my brother's grandmother wouldn't let them go because it was difficult to catch flying dragonflies during the day. Only when it was dark that night and dragonflies rested on branches and grass leaves did they have a chance to catch them. However, it is easy to find snakes unexpectedly in the wild grass at night, so my brother's grandmother resolutely refused to let them go, so they didn't go.

Later, I heard some rumors that a middle-aged man in a neighboring village took his own children to catch dragonflies by the pond with a flashlight, and the children helped him hold the flashlight. It is said that there is a willow tree that is not very big by the pond. He grabbed the stout branches of the willow tree with one hand and the dragonfly on the thatched leaves next to him with the other, but at this moment, an accident happened: the branches of the willow tree broke and the man fell into the water at once. When the child saw this scene, he was frightened and cried for help in despair. But the countryside is vast and sparsely populated, and it is a night in the middle of nowhere, and no one can hear it at all. It was not until the villagers who went out to weed the grass the next morning that they found the children huddled in horror and couldn't say a word. They just looked at the water and kept shaking and crying. The villagers finally had their father salvaged, and then their relatives arrived and took him back. Because of the great stimulation, the child didn't even go to school later, and he was confused. After such a blow, mother cried at everyone, and finally her health became worse and worse, and she couldn't do any heavy work.