noun
a European award for beaches based on cleanliness and safety
（欧洲）海滩"蓝旗奖"（根据清洁和安全程度评定）
(Motor Racing)a blue flag used to indicate to a driver that there is another driver trying to lap him
(赛车)蓝旗（告知车手另一车手想超车的信号旗）