Search for extraterrestrial intelligence, the designation of a series of projects based mainly on attempts to detect artificial radio transmissions from outer space.
外星智能探索（探测来自外层空间非自然无线电波系列计划的名称）
Definition of SETI in US English:
SETI
abbreviationˈsetē
Search for Extra-Terrestrial Intelligence, the designation of a series of projects based mainly on attempts to detect artificial radio transmissions from outer space.