（精）Unit 3 Security 全新版大学英语第三册第三单元课件.ppt

19.? barrier: thing that prevents progress or movement e.g. The driver slowed down as he approached the police barrier. The program serves as a barrier that stops children viewing unhealthy programs on the Internet. 20.? barricade: a barrier of large objects, intended to stop an enemy; block with a barricade e.g. The rioters barricaded streets with piles of blazing tyres. Protesters have been putting up barricade across a number of major streets. 21.? wander: move about without a fixed purpose ( followed by about /around/ through etc.) e.g. When he got bored he wandered around the campus. We wandered through the old part of the town, totally lost. Many people from the rural areas wandered from town to town looking for work. 22.? take off: ( aircraft, bird or insect ) move from the ground and begin to fly e.g. Kids like watching planes take off and land. The plane didn’t take off on time because of the heavy storm. 23.? hold/ keep (sb.) at bay: prevent ( an enemy, pursuers, etc.) from coming near e.g. Eating oranges keeps colds at bay. She left the light on at night to keep her fears at bay. 24.? sideways: to, towards or from the side (a., ad.) e.g. Alfred shot him a sideways glance. If you would move sideways to the left, I can get everyone on the picture. 25.? stand for: represent; mean e.g. He hates us and everything we stand for. That newspaper is often thought to stand for freedom of speech. “GMT” stands for Greenwich Mean Time. 26.? be bathed in: cover or envelop as if with liquid e.g. The fields and woods were bathed in a golden light at sunrise. He was interviewed in a room bathed in soft red light. She bathed her feet in warm water to relieve the pain. 27.? analyze: examine sth. in detail in order to understand it, esp. by considering separately all the elements it consists of