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英国空军一架“哨兵”战场监视飞机飞越群山，最近这种飞机在空袭ISIL行动中累计出动达到了100架次。（The Royal Air Force's Sentinel battlefield surveillance aircraft recently completed it's 100th sortie in counter- ISIL operations. Sentinel forms a key part of the RAF'S Intelligence, Surveillance, Target Acquisition and Reconnaissance Force, along with E-3D Sentry airborne command and control aircraft, Reaper remotely piloted aircraft systems and Airseeker electronic Surveillance aircraft. Airseeker has also recently completed its 100th operational sortie in the fight against ISIL.）