blue flag

noun
🔊/ˌbluː ˈflæɡ/
🔊/ˌbluː ˈflæɡ/
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  1. (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)
  2. 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