Last spring, Nie Li went to a beehive to play, and found that many bees gathered on the beehive, their wings were not flapping, and they were still buzzing. So she questioned the teaching materials, popular science books and teachers' explanations and began experiments and research on bees. First, she glued the bee's wings to the board, and the bee would still make a sound. She cut off the wings of the bees, and she could hear the bees chirping. The two methods were carried out alternately for 42 times, using 48 bees each time. The experimental results show that bees can make sounds without flapping their wings. In order to explore the vocal organs of bees, she glued the bees to the board, looked for them carefully with a magnifying glass and observed them for more than a month. Finally, two black spots smaller than rapeseed were found at the root of bee wings. When the bees buzz, the black spots stir up and down. She pricked the little black spot with a needle, and the bee stopped making noise. She also found some bees. They didn't damage their wings, but just pierced the little black spots and put them into the mosquito net. Bees fly around, and there is no sound anymore. She repeated the experiment 10 times and the results were the same. She wrote this discovery into her paper and thought that the vocal organs of bees were these two small black spots.