由于人类有意识或无意识地把某种生物带入适宜其栖息和繁衍的地区，其种群不

As human beings consciously or unconsciously bring a certain organism into the area suitable for its habitat and reproduction, its population is continuously expanding, and the distribution area is gradually and steadily expanding. This process is called ecological invasion. The successful invasion of alien species often needs to go through several main stages, such as introduction, invasion, establishment and spread.

As humans consciously or unconsciously bring certain organisms into areas suitable for their habitat and reproduction, their population continues to expand, and the distribution area gradually expands stably. This process is called ecological invasion. The successful invasion of alien species often needs to go through several main stages, such as introduction, invasion, establishment and dissemination.

Because human beings consciously or unconsciously bring certain creatures into areas suitable for their habitat and reproduction, their populations are constantly expanding, and their distribution areas are gradually and steadily expanding. This process is called ecological invasion. Successful invasion of alien species often needs to go through several main stages, such as introduction, invasion, establishment and dissemination.