1. Ripe knot: Aquilaria sinensis fell down after death and experienced various external factors such as sun exposure, wind and rain. In this process, part of it rotted, and the last part that didn't rot was agarwood.
2. Knotting: When the tree is alive, it is damaged by the outside world, resulting in a wound. In order to protect themselves, trees secrete resin from these wounds that have appeared but have not healed. Under the action of surrounding bacteria and microorganisms, these resins gather together and become oil, which is called agarwood.
3. Insect leakage: Insect leakage means that insects take Daphne as their nest, and then their secretions combine with Aquilaria sinensis oil of Daphne to form Aquilaria sinensis.
4. Falling off: Falling off is mainly caused by external forces, such as human factors and natural factors.