old boy network 熟人关系（俚语）

英文释义

An unethical arrangement by which jobs and privileges are offered exclusively to relatives or friends of a privileged male group of old friends.

例句

Top administrative jobs were only available at the university to professors who were members of the school's old boy network.

在大学，只有处于学校的关系圈里的教授才能担任高级行政职务。