单词backscratching
n.: 互开方便之门
网络: 互相利用；互施恩惠
互开方便之门，互相利用（常指从事非法活动）:
the fact of giving sb help in return for help that they have given you, often in connection with sth that might be illegal
She was hired straight from a government ministry, instead of the commercial sector with its backscratching culture.
她Google是直接从政府部办招募进来的，而非来自相互利用的商业部门。