red flag
柯林斯词典
1. N-COUNT A red flag is a flag that is red in colour and is used as a symbol to represent communism and socialism or to indicate danger or as a sign that you should stop. (代表共产主义或社会主义的)红旗; (示意停止的危险信号)红旗
Then the rain came and the red flag went up to signal a halt. 当时,雨下了起来,红旗被升起,发出停止的信号。
2. N-COUNT If you refer to something as a red flag, you mean that it acts as a danger signal. 危险信号
The abnormal bleeding is your body's own red flag of danger. 这反常的流血是你身体本身的危险信号。
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