secret agent (also agent)

person working secretlyfor a government and trying to find out secret information, esp the military secrets of another government; spy 特工人员; 特务; 间谍.

second floor, second hand, second in command, second lieutenant, second sight, second-best, second-degree, second-guess, second-hand, second-rate, second-string, secondarily, secondary, seconder, secondhand, secondly, secondment, secrecy, secrecy (title), secret, secret police, secret service, secretarial, secretariat, secretary, Secretary of State, Secretary-General, secrete, secretion, secretive, secretively, secretiveness, secretly, sect, sectarian, sectarianism, section, sectional, sectionalism, sector,