The east wind is coming.

The east wind is coming: generally speaking, good luck and opportunity are coming.

I. Dongfeng

Dongfeng is a Chinese word, which refers to the wind blowing from the east. Dongfeng also means that the journey is long, it is difficult for relatives to meet each other, and everyone dies. Another metaphor is the motive force or momentum of revolution and progress. For example, the east wind blows among the broad masses of workers, peasants and working people, but some cadres are still very calm.

Second, the wind

Wind is a natural phenomenon on the earth, which is caused by solar radiation heat. Sunlight shines on the earth's surface, causing the surface temperature to rise, and the surface air to expand and become lighter and lighter. After the hot air rises, the cold air with low temperature flows in horizontally, and the rising air falls down because it gradually cools and becomes heavier. Because the surface temperature is high, it will heat up the air, and this airflow will produce wind.

Meteorology calls the horizontal movement of air wind. Usually expressed by wind direction and wind speed. Wind energy promotes the conversion between dry and cold air and warm and humid air, which is one of the main factors of weather change. Wind is a kind of natural energy. Wind direction is often expressed in 16 or 8 directions. Wind speed is the travel of the wind in unit time.

Third, the division method of wind

Wind speed refers to the horizontal distance of air flow per unit time. According to the phenomenon caused by the wind to the ground objects, the wind is divided into 13 grades, which are called wind grades. The "East Wind Level 3" that people usually hear in the weather forecast refers to the "Beaufort Wind Level". "Beaufort Wind Scale" is a wind scale determined by Beaufort 1805 in Britain according to the influence degree of wind on ground objects, and * * * is divided into 0~ 17.

Fourth, the agricultural function of wind.

Wind is one of the environmental factors of agricultural production. Moderate wind speed plays an important role in improving farmland environmental conditions. The increase of wind speed accelerates or strengthens the surface heat exchange, evapotranspiration of farmland and the transportation of carbon dioxide and oxygen in the air.

Wind can spread plant pollen and seeds and help plants pollinate and reproduce. Wind energy is widely distributed and inexhaustible. Monsoon prevails in China, which is beneficial to the growth of crops. The Inner Mongolia Plateau, the Northeast Plateau, the southeast coast and the inland mountainous areas are rich in wind energy resources, which can be used as energy development and utilization.