vested interest
noun uk/ˌves.tɪd ˈɪn.trest/ us/ˌves.tɪd ˈɪn.trɪst/
[ C ]既得利益
a strong personal interest in something because you could get an advantage from it
As both a teacher and parent, she had a vested interest in seeing the school remain open. 身为教师兼家长，保证学校不被关闭符合她的既得利益。
vested interests[ plural ] often disapproving 既得利益人群;既得利益集团
people or organizations who have a financial or personal interest in a business, company, or existing system
A compromise has to be reached between all the powerful vested interests before any restoration work in the city can take place. 势力强大的各既得利益集团间必须先达成妥协，城市整修工作才有可能开始。
We need to give those vested interests a good reason to support our proposals.
Reform is very difficult because the vested interests are set against change.
It can feel as though government policy is influenced more by vested interests than by the voting public.
These tax proposals serve only the vested interests.