a line of police , soldiers , vehicles , etc . positioned around a particular area in order to prevent people from entering it
发音
例句
1. Police officers threw a cordon around his car to protect him. 警察在他汽车周围设置了防卫圈以保护他。 2. There is a tight security cordon around the area. 这一地区周围设有严密的安全警戒圈。