"ant tribe" is not an insect group, but a little-known huge group of "post-8s generation"-"low-income group of college graduates", which refers to the college students who live in the urban-rural fringe after graduation because they can't find a job or their work income is very low. "Ant tribe" is a typical summary of "low-income group of college graduates". They are "weak and strong" like ants, and they are a huge group that is little known.