Annual ring意思

"Annual ring" or "growth ring" refers to the layer of wood that forms in trees during a single growing season. Each year, a tree adds a new layer of wood on the inside of the bark, which can be seen as a ring when the tree is cut down and the trunk is examined. These rings can be used to determine the age of a tree, as well as to study past climatic conditions and environmental changes. The width of the annual rings can vary depending on factors such as the amount of rainfall, temperature, and the health of the tree.