secret agent

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Another ex-Secret Service agent, Christopher Falkenberg, says personal protection has to be accompanied by good intelligence on potential threats.
另一位前秘密特工克里斯托弗。法尔肯伯格说，贴身保卫必须跟有关潜在威胁的准确情报相配合。
(In Listing 6 I did my best impersonation of a top-secret government agent by crossing out my user ID with XXXXXXXXXXXX.) Let's parse this request a little more.
（在清单 6 中，通过使用 XXXXXXXXXXXX 来代替我的用户 ID）现在我们进一步分析此请求。
Salt captures the breathtakingly dangerous life of the secret-service agent: shoot-outs, car chases, death lurking around every corner. Was Mahle's life really like that?
《特工绍特》展现了秘密特工令人咋舌的危险生活：枪战、汽车追逐、死亡遍布每一个角落。

So the web edition of the Dallas Morning News scooped the world in claiming that a secret-service agent had seen Monica Lewinsky and President Clinton alone together.
ECONOMIST: Gossip on the web
The financier, who has swapped his Czech citizenship for Irish, failed to appear in a court in Plzen, a provincial city, on March 17th to testify in the retrial of a former secret-service agent, Vaclav Wallis.
ECONOMIST: Czech investment funds
The problem is that everyone seems to engage not only his interest but also his sympathy: Fernando (Pedro Cardoso), the kidnapper on whose memoir the movie was based, is nagged by doubt, and even the secret-service agent who specializes in torture is unable to sleep at night.
NEWYORKER: Four Days in September

a government employee whose job involves getting secret information about the governments of unfriendly foreign countries

A secret agent is a person who is employed by a government to find out the secrets of other governments.