secret service

secret-service的词性：
n.（名词）

1. Intelligence-gathering activities conducted secretly by a government agency.
情报局：由政府部门秘密指挥的搜集情报的活动

2. A government agency engaged in intelligence-gathering activities.
特务机关：从事搜集情报活动的政府机关

3. Secret Service A branch of the U.S. Treasury Department concerned especially with protection of the President.
Secret Service 财政部特勤处：美国财政部的一个部门，其工作特别涉及对总统进行保护