blue flag
noun/ˌbluː ˈflæɡ/
/ˌbluː ˈflæɡ/
- (British English) a blue flag used in motor racing to show that a driver who is much further ahead is trying to pass
蓝旗（赛车中用以示意后方有领先车手试图超车） - an award given to beaches in Europe that are clean and safe
（为欧洲清洁安全的海滩颁发的）“蓝旗” 奖