It means forest. Forests, known as the lungs of the earth, are an important part of terrestrial ecosystems and valuable resources with global significance. Forests regulate the air and water circulation in nature, and have multiple functions such as carbon fixation and oxygen release, water conservation, wind and sand fixation, climate regulation and biodiversity protection. At the same time, they also play an important role in protecting human health, improving human settlements and providing resources and habitats. Human society benefits from forests and is highly dependent on them. The earth is the third planet with a distance of 0/0.50 billion kilometers from the sun, and it is also the only celestial body known to human beings that breeds and supports life. About 29.2% of the earth's surface is land composed of continents and islands, and the remaining 70.8% is covered by salty water bodies such as oceans and bays, as well as fresh water bodies such as lakes, glaciers and rivers, especially glaciers, which together constitute the hydrosphere. Most of the polar regions of the earth are covered with ice. The outer layer of the earth is divided into several rigid tectonic plates, which have migrated on the surface for millions of years, but still remain active inside, including a solid iron core, a liquid outer core that generates the earth's magnetic field, and a convective mantle that drives the plate structure.