n.

(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors

同義詞：undercover agent

a secret watcher; someone who secretly watches other people

Machine
Fact And Law—On The Meaning Of Watercraft’s Seaworthiness Obligation And Its Estimation Standard
CFSAN FOIA Electronic Reading Room - Letter to the Personal Care Products Council Concerning the Cosmetics Framework
SPIED
SPIED: Stanford Pattern based Information Extraction and Diagnostics
Climate: Millennial Climate Oscillation Spied
Millennial Climate Oscillation Spied
One in 20 East German Doctors Spied on Patients or Colleagues for the Stasi
Glycopeptide binding site spied through transferred heteronuclear NOE: carbon-13-labeled [1-13C]Ac-D-Ala-D-Ala bonded to vancomycin ...
Viable But Variable Ancient El Nino Spied