The revelation of nature is 400 words for the fourth grade composition.

Have you ever seen a mountain? This mountain is very big. Have you ever seen the sea? The sea is vast. I have always believed that people can understand a lot in nature. Nature contains many philosophies of life. Just like the moon, the full moon and the lack of the moon represent the reunion and separation of relatives and friends. Ants and aphids show cooperation and mutual assistance in order to survive. Have you ever seen a bee living alone? They pay attention to the spirit of unity and division of labor.

Nature has also brought me years in a hurry, so I must cherish the enlightenment of time. Look at the sunrise and sunset, as if the sun has just risen, but the stars and the moon are sparse in the blink of an eye. Cordate telosma quietly blooms and fades. If the fallen flowers and leaves once represented the end of a gorgeous life, it would be too short. The glory when the bud was born suddenly turned into lifeless dryness! Butterflies will also die in the cold fragrance of flowers in Xia Hou during the busy season.

Life is short, but if we can make it shine, it can be called eternity, can't it!

Enlightenment of natural constituent materials

Japanese scientists were inspired by ants foraging. They developed a large-scale integrated circuit to simulate the foraging ants Qixin carrying food together and sending information from the nearest "food source" to the "ant nest" in sequence. According to this new information processing method, it is possible for people to develop a computer with a new computing mode.

There are still many inspirations from nature, such as: imitating the characteristics of egg shape and building arch bridges; Inspired by the flight of birds, people invented airplanes. I cut off my fingers from the thatch and invented the saw ... There are many animals and plants in nature, which hint at the mysteries of nature in their own unique way of life.

There are many inspirations from nature. There is a kind of snake called rattlesnake. It has an infrared eye. Through the eyes of this snake, human beings have developed a missile with eyes like rattlesnakes. Its name is rattlesnake missile, so it is named rattlesnake missile, because humans are made according to the eyes of rattlesnakes.

Sidewinder missiles, like rattlesnakes, can accurately track the enemy with "hot eyes" until they are destroyed. Because the "hot eye" of the rattlesnake judges the position of the enemy according to its temperature, the rattlesnake missile can accurately hit planes, warships, tanks and the like. The mobile low-altitude short-range all-weather ground-to-air missile developed by France is mainly used to deal with low-altitude and ultra-low-altitude fighters and armed helicopters to defend the airport. It can also be used against cruise missiles. The missile is 2.94m long, with a diameter of 0. 156m, a weight of 84.5kg, a launcher length of 3.02m, a warhead focused on fragments, a total weight of 13.9kg and a killing radius of 6 ~ 8m m. The power plant is a single-stage solid rocket engine, and the guidance mode is full-range radio command guidance with a combat radius of 500 ~.

Colorful butterflies, such as butterflies with double moon stripes, monarch butterflies with brown veins, especially butterflies with fluorescent wings, have their hind wings that turn from golden to green and from purple to blue in the sun. Scientists have brought great benefits to military defense by studying the color of butterflies. During World War II, the Germans surrounded Leningrad in an attempt to destroy its military targets and other defense facilities with bombers. According to people's camouflage at that time, Vanovic, an entomologist in the Soviet Union, suggested that the color of butterflies was not easy to be found in flowers, and military facilities were covered with butterfly-like camouflage. Therefore, although the Germans went all out, the military base in Leningrad remained safe and undisturbed, laying a solid foundation for winning the final victory. According to the same principle, people later produced camouflage uniforms, which greatly reduced the casualties in the battle.

The beehive is composed of hexagonal small beehives arranged neatly, and the bottom of each small beehive is composed of three identical diamonds. These structures are exactly the same as those accurately calculated by modern mathematicians-rhombic obtuse angle 109.28' and acute angle 70.32'. They are the most material-saving structures, and they are large in capacity and extremely strong, which makes many experts admire them. People imitate their structures and make honeycomb sandwich panels with various materials. It is not easy to conduct sound and heat, so it is an ideal material for building and manufacturing space shuttles, spaceships and artificial satellites. A polarizer sensitive to the direction of polarized light is arranged adjacent to each monocular of the compound eye of bees, which can be accurately located by using the sun. Based on this principle, scientists have successfully developed a polarized light navigator, which has been widely used in navigation.

Dragonflies can generate local unstable airflow different from the surrounding atmosphere through the vibration of their wings, and wells use the vortex generated by the airflow to lift themselves up. Dragonflies can soar under a small thrust, not only forward, but also backward and left and right. The forward flight speed can reach 72km/ h, and the flight behavior of dragonflies is simple, with only two pairs of wings flapping constantly. Scientists have successfully developed a helicopter based on this structure. When an airplane flies at high speed, it often causes violent vibration, and sometimes even breaks the wing, resulting in the plane crashing. Dragonflies are safe when flying at high speed, so people follow the example of dragonflies and add counterweights to the wings of aircraft to solve the thorny problem of vibration caused by high-speed flight.

Fleas have a high jumping ability, and aviation experts have done a lot of research on it. Inspired by its vertical take-off, a British aircraft manufacturing company has successfully manufactured a harrier aircraft that can take off and land almost vertically. According to the structural characteristics of insect's single compound eye, modern TV technology has made a large-screen color TV, and can also make a small color TV screen into a large picture, and can frame several specific small pictures at any position on the same screen. The same picture and different pictures can be displayed. According to the structural characteristics of insect compound eyes, scientists have successfully developed a multi-aperture optical system device, which is easier to find targets and has been applied in some important weapon systems abroad. According to the mutual inhibition principle of some aquatic insects compound eyes and monocular eyes, an electronic model of lateral inhibition is made and used in various photographic systems. The photos taken can enhance the image edge contrast and highlight the outline. It can also be used to improve the display sensitivity of radar, and can also be used for preprocessing of character and image recognition systems. Based on the processing information of insect compound eye and the principle of directional navigation, the United States developed an engineering model of terminal guidance seeker imitating insect compound eye search. Japan has developed new construction methods of construction machinery and buildings such as hexapod robots by using the morphology and characteristics of insects.