危险信号 meaning in Chinese

danger signal
dangerous signal
red flag
red light
warning signal

A train must not pass a signal that means danger .
火车切不可越过危险信号。
The signal is at danger .
（前面）有危险信号。
As soon as he led the conversation round to borrowing money i saw the red light .
当他一把话题扯到借债的事，我就感到了危险信号。
They re like a walking warning sign against romance
那像是浪漫的危险信号
They ` re like a walking warning sign against romance
那像是浪漫的危险信号

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