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1. Oxford Dictionary

   danger signal

   • n.
     a railway signal indicating that the line is not clear and instructing the driver to halt.；an indication that a bad or dangerous situation is likely to develop

   • noun: danger signal, plural noun: danger signals

2. • 釋義

   n.

   名詞

   • 1. a railway signal indicating that the line is not clear and instructing the driver to halt.
   • 2. an indication that a bad or dangerous situation is likely to develop a rise in tobacco use by teenagers is a danger signal
3. • 更多解釋

   danger signal

   • n.
     a railway signal indicating that the line is not clear and instructing the driver to halt.

   Oxford American Dictionary