| 词汇 | red flag | 
| 释义 | red flag  noun [ C ] uk/ˌred ˈflæɡ/ us/ˌred ˈflæɡ/  (用作危险信号的)示警红旗 a flag used as a sign of danger or to tell someone in a race to stop  You're not allowed to swim when the red flag is flying. 示警红旗升起的时候不允许游泳。   The official waves a red flag if it's a false start.  (象征革命的)红旗 a flag used as a symbol of revolution  "We're both radicals and we keep the red flag flying," says Betty.  | 
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