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smoke signal

noun
🔊/ˈsməʊk sɪɡnəl/
🔊/ˈsməʊk sɪɡnəl/
[usually plural]
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  1. a signal that is sent to somebody who is far away, using smoke烟雾信号
  2. a sign of what somebody is thinking or doing（思想或行动的）标记，迹象