espionage

1. N-UNCOUNT Espionage is the activity of finding out the political, military, or industrial secrets of your enemies or rivals by using spies. 間諜活動(dòng)[正式]

The authorities have arrested several people suspected of espionage. 儅侷已經(jīng)逮捕了幾個(gè)涉嫌從事間諜活動(dòng)的人。