On the afternoon of July 20th, it rained heavily. After the heavy rain, I found a cicada parked on my windowsill, and my father caught it back. I observed for a while, and I will tell you what I observed: observation diary about 300 words: observation cicada.

　　Cicada has a pair of hard eyes, dad said it is compound eyes, composed of many small eyes, can have a very broad perspective, can see more things. Its mouth is round, the front end is a thin needle like, so it is to use this "needle" mouth to pierce the trunk and suck sap. It has six small and thin legs like a knife, which can firmly fix itself on the branch. It also has a pair of transparent big wings, and a pair of small wings under the big wings. After spreading, the thin big and small wings are combined together, flying steadily and soundlessly. His stomach is long and bulging. His father said that this is his abdominal cavity. "Cicada, cicada" is the sound of vibration in this place. There is an opening in the abdominal cavity for the male cicada, while the female cicada cannot be called because of the difference of physiological characteristics.

　　Cicadas live by sucking the sap of big trees. If a big tree is pierced with a lot of holes and sucks a lot of sap, the big tree will wither, so cicadas are big pests. But dad said that cicada had to take off a shell when he crawled out of the soil, and then it was like this. The "cicada shell" retreated was a traditional Chinese medicine.