VOA慢速英语:‘Eye in the Sky' Looks at Drone Strikes

thriller – n. a novel, movie or theatrical production that is exciting; a story full of exciting action, mystery or suspense

cell – n. a small group of people who work together secretly as part of a larger organization or group

massacre – n. the violent killing of many people

zone – n. an area that is different from other areas

cool under fire – expression of calm at a time of threat or unease